What Does This Red Light On Motherboard Mean?

By | August 2, 2021
What Does This Red Light On Motherboard Mean
What Does This Red Light On Motherboard Mean

What Does This Red Light On Motherboard Mean?

A red light on your Motherboard means that internal hardware is either wrongly plugged in or is not working. The CPU, RAM, and graphics card are examples of internal hardware.

A dead CMOS battery may be blame. The red light might also be caused by boot problems on the hard disc where the primary OS is installed.

The red light shows when the computer is turned on; however, it seldom boots, enters the bios, or displays information on the monitor.

The particular fault is determined by the Motherboard and the location of the red light. Some motherboard makers provide labels that describe what’s wrong with the board.

Motherboards Red Light Response to No Display

A red LED light on the Motherboard mean as a warning indication to the user. For example, a single or several lights on the Motherboard might alert the user of a hardware issue. When any hardware is not connected correctly or becomes corrupted, these lights become red.

The previous motherboards just had one light, and the user had to search through all of the circuitry to figure out what was wrong.

It was stressful; a solution was required since if the machine does not start and the red light illuminates, there is a hardware problem. Still, to determine the issue, it was necessary to examine all of the computer components to determine the PC’s actual problem.

More than one red light is now found on contemporary motherboards. The CPU, RAM, GPU, and Boot all have a light indication. These many signs have made it extremely simple for the user to locate and resolve the issue.

It is helpful if the computer won’t power on since the user can see inside the casing, quickly determine which hardware component is causing the issue, and fix it. In addition, it can help save time spent attempting to solve the problem on one’s own.

Causes of Red Light on Motherboard and How to Fix Them

Now we’ll look at each of these indicators separately to see what they indicate and what problems may cause these red lights to illuminate.

1. Hardware Connection Problems

Almost every Motherboard has an EZ Debug LED section. At least four LED indications to correlate to undiscovered or malfunctioning CPU, RAM, GPU, and BOOT devices from top to bottom. In addition, these LEDs are used to check the status of the connection between these components and the Motherboard.

What Happens When The CPU Red Light Is ON?

When there is an issue with your processor, the CPU light on the Motherboard illuminates. The processor is your computer’s brain, and if there is a problem with it, your computer will not turn on. Any issue with the CPU might result in the red CPU light on the Motherboard.

For example, the CPU may have fallen out of the socket, or the fan over the processor may be broken, causing the CPU indicator to light. When the CPU fan is not connected correctly or is malfunctioning, the light flashes red.

It’s because the CPU generates a lot of heat when operating, and if the fan isn’t functioning correctly, it might result in severe damage.

The depleted CMOS battery might also be the cause of the CPU red light turning on. If the CMOS battery is not charged, it might cause issues while turning on the computer, causing the CPU red light to illuminate. These were the issues with the Motherboard’s red CPU LED light, which might cause it to glow.

Which Indication Show by DRAM Red Light

A red light near the RAM is also visible on the Motherboard. This red light is the RAM indication, and it indicates an issue with the PC’s Random Cases Memory. When there is an issue with the Motherboard, the computer will not switch on, and a red light will appear on the Motherboard.

A missing or damaged RAM might be the source of the problem. The issue may resolve by removing the RAM and replacing it in the slot. Push the RAM into the RAM slot until the clamps click into place and the RAM is completely enclosed.

If the clamps don’t click, the RAM isn’t adequately secured, leading to a recurrence of the problem. If the RAM is correctly locked in, but you still get a blinking red light on the Motherboard, and no display or the PC won’t switch on, the RAM might be contaminated, and you’ll need to replace it.

A Lit Red Light for GPU

The blazing GPU or VGA red light on the motherboard signals that the video card placed in the Motherboard is having issues. Either the card is corrupted, or it is plugged in incorrectly.

The illuminated red LED light on the Motherboard near the GPU might be triggered by faulty video card power connections or the video card itself.

There will be a lighted red LED light on the Motherboard and no display on the PC due to this. To fix the problem, double-check the power connectors and re-plug the video card.

A Lit Red Light for Boot

When the system is unable to locate the boot device, the Boot LED light illuminates. A corrupt or loose boot device might cause a red light on the Motherboard.

A boot device is the storage device where the PC’s operating system is kept, or, to put it another way, where the PC’s window is stored.

To fix this, make sure the power connections and the device’s plugs aren’t loose. Then, please restart the computer after they are correctly linked. If the issue persists, the storage device might be corrupted.

2. Other Hardware Problems

The same red light on your Motherboard means might potentially signal particular motherboard-to-installed-component compatibility concerns. It might also mean that one of your PC’s components needs to be replaced.

Compatibility Of Your PC

Compatibility difficulties are rare unless you double-check every time you buy computer parts individually. Then, when you buy a whole computer system, your local tech store will almost always guarantee that all of the components are compatible.

Broken Parts Of New System 

You may have to say goodbye to an inevitable cog in your computer system at some point. Any component that has been in use for an extended period might degrade and eventually quit operating.

A red LED on the Motherboard might mean the component has reached the end of its useful life. It would be a good idea to begin shopping for new replacement components now.

Incorrect BIOS Settings

Any solid red light on the Motherboard might potentially indicate that the BIOS settings are wrong. The basic input/output system (or BIOS) is the first software that your CPU executes after pushing the power button to start the entire computer system.

It’s also the software that controls data transfer between the operating system, storage discs, display adapter, keyboard, mouse, and printer.

You may have messed with a few BIOS changes, causing your computer to fail to boot up correctly and display a red LED. To solve this, go through your Motherboard’s manual one more time for instructions and diagrams on how to reset the BIOS.

The illustrations will show you where to look for a reset switch or a jumper that you can short to restore the default BIOS settings.

You can also remove the CMOS battery (again, according to the schematics) and replace it after more than five minutes. Finally, it will clear all of your BIOS inputs and return them to their original settings.

CMOS/BIOS Battery Issues

Most modern motherboards solely require the button-type battery to power the Real-Time Clock’s onboard oscillator and clock circuitry (RTC). Thus, even when the computer is turned off, the battery keeps the oscillator and clock operating (to display date and time correctly whenever it goes on).

However, on earlier motherboard models, the same battery delivers a little power to preserve BIOS settings when the entire system is turned off. CMOS stands for Complimentary Metal Oxide Semiconductor, despite the term “CMOS battery.” It’s a technique for making integrated circuits.

Over time, “CMOS” became a general word for low-power area RAM that used a CMOS chip and a button cell on the Motherboard. When the computer is turned off, the battery must preserve user-settable BIOS settings in this static RAM region.

Drained CMOS/BIOS Battery

If your Motherboard is ancient and still requires a battery to keep BIOS settings up to date, the battery will eventually run out of energy. In addition, a red light on your Motherboard may illuminate here, indicating that something prevents your system from loading the basic BIOS settings before starting.

Although a CMOS battery may last up to ten years, depending on how often you use your computer, you may wind up depleting one. Remember that the onboard BIOS only utilizes the battery while the computer is switched down; therefore, the CMOS battery will last longer if you use your computer frequently.

Overheating Of Computer System

Alternatively, a blinking red light, or any light for that matter, might indicate that your computer system is overheating. Take off the side panel of your computer case and look at the heat levels around your CPU and graphics cards to see whether this is the case.

Some of your computer cooling system components may be broken or improperly linked to a power source. In addition, some computer RGB systems let you control any onboard RGB lighting equipment to alert you to any potential overheating concerns.

POST Test Signals

A red light on your Motherboard might mean that inbuilt POST checks have discovered incorrect signals. POST stands for “Power-On Self-Test,” a set of system checks performed by your computer at the start of each boot cycle.

A POST analyses the hardware to see if the CPU, DRAM, and hard drives function correctly and in sync. If all of the tests are passed, your computer will return to the home screen.

Otherwise, the POST displays text on the screen, emits loud beep noises, or emits red LED light signals. If the BIOS screen is operational, warnings like “CPU error – undetected” or “Missing visual adapter or defective memory” may appear.

If you don’t, you’ll hear a series of beeping sounds and see a series of red lights. By reviewing your motherboard handbook or examining the product website on another device, you may figure out what each problem beep or light code means.

How to Fix These Problems?

It is a problem that any PC user may encounter; we have defined the red LED light on the Motherboard mean above and provided detailed remedies to the difficulties associated with each red LED light on the Motherboard.

When just these red LED lights are switched on and no display on the monitor, we will offer you a complete solution to the problem and teach you how to bring your PC back to life.

Reset BIOS if The Red Light on Your Motherboard 

Start resetting the BIOS if you have a red LED light on your Motherboard but no display. The BIOS, on the other hand, maybe reset by removing the Motherboard’s CMOS battery.

A CMOS battery is located on the Motherboard; switch off the computer and remove the battery for 3 minutes. Next, replace the battery and switch on the system; if the display still does not appear, go to the next step.

Replace CMOS After Red Led Light Switching ON

Due to an empty CMOS battery, the red LED light can switch on. Attempt to power on the computer after replacing the old battery with a fresh one. If the CPU light on the Motherboard remains red, go to the next step.

Remove Hardware if Motherboard Red Light ON After Resetting The BIOS

If the Motherboard still has lighted red lights after resetting the BIOS and replacing the CMOS battery, Remove all of the Motherboard’s hardware and try again. Unplug all connected components from the Motherboard and inspect each connection and socket thoroughly.

 Check each plug and socket; if any pins are missing or deformed, try repositioning them with a tiny screwdriver or other metal instruments.

Then, connect everything back together and switch off the PC after a careful and in-depth inspection of all connectors. Continue to the next step if the problem persists and the Motherboard still has a bright LED light but no display.

Check the RAM If The Problem Is Not Resolved. 

If the three problems aren’t being resolved, possible that hardware is to blame. So please begin with the RAM and work your way through the other physical components to determine a problem.

If your Motherboard has more than one RAM slot, try booting the computer one at a time. Try first, then second, third, then fourth. If the PC won’t display on any of them, borrow some RAM from a friend and try booting again.

All of your RAMs are broken if the system boots up. Continue to the next component if the computer still does not switch on.

GPU Check or Remove and Try To ON Your System Without It 

Remove your graphics card from your computer and try to turn it on without it. If the motherboard CPU lacks integrated graphics, borrow an available GPU and restart the computer. If the PC boots up and displays well, go to the next device.

Storage Devises Check

If your system isn’t displaying anything, try booting with a borrowed storage drive, or if you have many storage devices, try turning them on alternately to see if it works. If you’re still having trouble, move on to the next step.

Disconnect External Connectors

Remove any external connectors from the computer. Next, remove all external devices or cables attached to the PC, including your keyboard, mouse, and speakers. Next, connect the power and display cables to the computer.

Could you switch it on and see what happens? If the computer boots up, begin connecting all of the cables and devices to see which is broken. Then, remove it and have fun with your computer.


The LED lights on the Motherboard mean there is a sign of a problem. These days, motherboards are equipped with four LED lights that indicate problems with various computer components. We’ve gone over the LED lights on the top two motherboard brands and how to fix them.

If any of these LED lights turn off while following the advised approach for resolving the issue, if the proposed technique for addressing the problem does not work, follow the whole procedure to remove the lighted LED light.

If you don’t think you’ll be able to complete the work, seek expert assistance because your unskilled techniques may make things worse.