If you’ve ever looked at your motherboard and wondered why the case lights are so bright, then you’ve come to the right place! A lot of people don’t realize this, but the little red light on your motherboard is actually part of the system power supply circuit and shouldn’t really be there.

If you have this light on your motherboard, however, it can either mean that something is wrong with your computer, or it could simply be an indicator for something else entirely.

A little research into the topic will help you decide which possible solution works best in your case so that you can avoid paying an expensive repairman or replacing the motherboard completely.

Here is everything you need to know about red lights on motherboards.

How to Read a Red Light on a Motherboard?

There are four main red light indicators on the motherboard. These indicators give a clue on what could be the problem. The indicators are labeled (BOOT, VGA/GPU, DRAM, & CPU); thus are easily differentiated.

BOOT Red Light

A red light on the BOOT indicator signifies boot-related issues. The boot contains the hard drive where the computer’s operating system is. It’s the device that enables the smooth launching and functioning of the computer.

VGA/GPU Red Light

A red light on the VGA/GPU indicates graphics-related issues.

There are three possible causes for a red light at VGA:

  • The computer has failed to detect an attached display. This could be due to a broken or disconnected video cable, or faulty port.
  • The graphics card itself is damaged (rare).
  • The computer is not sending enough power to sustain the proper operation of the graphics card thus resulting in failure.

If you have another compatible graphics card and it works in your system, then test your original card with a known working PC. If both cards fail to work then you most likely have a faulty GPU, contact the manufacturer if it’s under warranty or replace it otherwise.

DRAM Red Light

DRAM indicator being lit means RAM error and is commonly caused by improperly seated memory modules that are not making good contact with their connectors. Test DRAM using Memtest86+ for at least 4-6 hours before concluding there’s an issue.

CPU Red Light

A red light at the CPU indicates a problem with the CPU or rather the processor. First and foremost, ensure that your motherboard supports your specific processor and that you have installed it correctly according to manufacturer specifications.

What Does the Red CPU Light on a Motherboard Mean?

The purpose of CPU fans is to keep your computer’s Central Processing Unit (CPU) cool. Motherboards contain one or more fan headers that make it possible for you to plug in additional fans if necessary.

Whenever you see a red light on the CPU indicator, it could mean one of the following things:

  1. The CPU is defective.
  2. You don’t have power or proper connection going to it (motherboard or CPU).
  3. The CPU heat sink is not installed properly or insufficiently screwed in (or both).
  4. The fan is not plugged in properly, or there is something wrong with it.
  5. You have installed your CPU improperly into your CPU socket (it’s important to install using an anti-static wrist strap).
  6. There are no fans plugged into your motherboard (or you might have unplugged one).
  7. The CMOS battery is dead.
  8. You could have fried components when you removed/replaced your CPU because you didn’t use an anti-static strap or put it back together right.

All these issues are pretty easy to check. If you are uncomfortable doing any of these repairs yourself, then contact someone who knows how to work with computer hardware and software. It should be done by an experienced technician who specializes in computers.

How Can You Tell If Your Motherboard is Dying?

If you see any red lights blinking, or if your computer is suddenly giving errors, that’s a good sign that something is going wrong with your motherboard. However, it’s sometimes not difficult to tell whether or not these issues are dangerous for your computer.

If you’ve tried all the strategies we’ve discussed to fix the motherboard problems but still, the red light keeps showing, it could mean that either the power supply or the motherboard is faulty.

Suppose you check and correct the power supply but the red light persists, this could be a red flag that your motherboard is dying or rather needs replacement.

However, if you do notice any unusual behavior from your machine (error messages are appearing for example) it’s best to replace the motherboard first before replacing other parts of your system. This way you can at least fix things before doing more damage to your system/hard drive.

The best way to prevent your motherboard from dying is with wiring in your motherboard. This helps to avoid moisture, especially liquid water, reaching and damaging any important computer components.

How to Troubleshoot Red Light Errors on a Motherboard?

Troubleshooting your computer when you’re receiving one of these lights is essential if you want to get it back up and running. These lights are an indication that there is something wrong with your hardware, so try these solutions before calling in a professional to diagnose and repair them.

1. Reset the BIOS

One of the most effective ways to solve a computer that won’t boot is to reset your BIOS. This will reset your motherboard settings and could resolve many issues.

Follow these steps:

  • Remove your CMOS battery and let your computer sit for 15 minutes before getting the CMOS battery into place.
  • Another way to reset BIOS is to use a CMOS jumper. The jumper is located on your motherboard, next to your CMOS battery.
  • Find the jumpber and put it into place for 5-10 seconds, then move it back.
  • If that doesn’t work, your CMOS battery is probably dead and you’ll need to replace it before continuing.

2. Replace the CMOS battery

If resetting your BIOS doesn’t solve your problem, you may need to replace your CMOS battery. This small piece of hardware usually comes bundled with a note saying how long to expect it to last. If it is more than 5 years old, you’ll need to replace it.

Note that it must not be 5 years (or the indicated years); it could have a shorter life than expected if there was a power cut during those years or if you didn’t close your case for a prolonged period and temperatures became too high for extended periods.

3. Check the Hardware

If your BIOS check or reset didn’t solve your problem, it might be time to check your hardware. Hardware includes the RAM, CPU, GPU, and any other hardware connected to your computer’s motherboard.

  • RAM

With RAM, there are three things you need to check. First, if it is compatible with your computer. Then, if it is inserted correctly. Finally, if one of your modules has died and caused all other modules to fail.

To check compatibility or insertions issues, you will have to remove both modules and reinsert them one by one in different memory slots while rebooting until they work or don’t work. Replace each module as needed and retest your computer’s power button before moving on to testing your CPU and GPU.

  • CPU

With CPUs, there are three possible problems: bad CPU, incompatible motherboard, and not correctly seated CPU. You should test each one individually to find which is your problem.

If you only have one chip, testing it can be done easily: just take it out and insert another one in its place. Then you will know if your motherboard was at fault or if your chip was dead.

If you have more than one module available, testing them together can be achieved by using an LGA socket adapter that includes sockets for all sockets used by that processor or by buying an old computer (preferably without an LCD screen) with the same processor to use just its board as an adapter for that purpose.

  • GPU

If your graphics card is dead, no amount of testing will bring it back to life. However, there are two things you can try to determine if that is truly your problem.

First, look for some indication that something happened at bootup (for example computer makes noise during startup but does not load Windows or anything else).

If there was something that occurred during bootup and didn’t clear after rebooting from Safe Mode then you have good reason to believe your graphics card is not working anymore.

  • Other Hardware

There are many other devices that could potentially be dead and cause your problems. The only way to test them individually is by removing each device one at a time while rebooting after removing each one.

Once you have found which one is faulty, replace it with another compatible module or try reseating it first before deciding to buy an entirely new piece of hardware. It might just be misaligned in its slot.

Also, note that sometimes wires connecting these devices break inside their connectors so even if you remove them from their slots you will still have no luck; so be sure to check also any connections you can see.

4. Replace the Dying Motherboard

If none of these methods has found your problem, you can now replace it with something that works. You could buy another compatible version of the motherboard.

Why Does My Motherboard Have an Orange Light?

An orange light is often an indication of a normal power supply to the computer, but not always. If you’re seeing an orange light and don’t know what it means, here are some common possibilities: An amber or red-orange flashing LED indicates problems with your power supply unit (PSU) – whether that’s from under-powering or over-powering your system.

Specifically, if your computer is using 100 percent capacity and you aren’t overclocking, then it could be a bad PSU.

How to fix it?

The best solution in these cases is to purchase a new power supply unit—at least 500 watts, which should be more than enough for most computers.

Frequently Asked Questions

Solid vs Blinking Red Light, Which One is More Dangerous?

Solid red lights indicate that there is something wrong with your computer’s motherboard. This may be because of an internal issue or a problem with your hardware, but it is generally an indication that your machine has failed to boot.

In comparison, blinking red lights mean that there is something wrong with either your graphics card or PSU – which would render all of your components useless anyway so it’s best to avoid any troubleshooting steps unless you know exactly what you are doing.

How Do I Know If It’s My Graphics Card or PSU?

To get to your computer’s internal components, you will need to either disassemble your machine or remove its outer casing. If you are unsure of how to proceed with either of these tasks, stop!

Don’t make any further attempts until you have sought out an expert. There is a high voltage inside your computer and it can be dangerous.

How Long Does It Take For My Machine to Repair Itself Once I Turn It Off?

Most computers will automatically attempt to self-diagnose and repair any hardware issues when you turn them off. This process can take anything from 20 minutes to several hours, so try not to worry too much.

Could the Wrong Installation of Hardware Cause Further Problems?

Undoubtedly, yes! Before you attempt to install any additional hardware, you should thoroughly read your computer’s instruction manual – if there are any further warnings or requirements that need to be met before installation, they will be listed there.

Also, remember to unplug your computer from its power source while working inside of it.


No problem can’t be fixed with some time and research. If you’re getting a red light on your computer and aren’t sure what it means, don’t panic! Start by visiting our guide to diagnose the problem.

Once you find out what’s causing your red light problem, refer to our complete list of troubleshooting strategies that will help you diagnose and solve any possible issue.

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