Signs Of A Bad CPU: Watch for These Red Flags!

If your PC has been overheating, making weird noises, or crashing a lot, your CPU could be failing. And if you ignore it, your whole computer could eventually stop working.

If your current system has reached the point where you're considering a larger upgrade, you can also start your build around the performance you need.

For more PC troubleshooting help, check out our PC Troubleshooting playlist.

Let's break down the signs of a bad CPU and teach you how to fix it.

 

What Are the Signs of a Bad CPU?

Boot Issues

The most telling sign of a bad CPU is when you're having boot issues and the computer won't turn on at all.

Another common boot issue is when your PC turns on, but doesn't display anything.

Your system might also go through a boot loop, where it turns on, shuts off, turns back on, and continues repeating that cycle.

Performance Problems

The next possible sign of a bad CPU is performance problems in applications or games.

This can include:

• Slow or unresponsive games
• Applications crashing
• Games crashing
• A total system lockup

With a total system lockup, the computer can become completely unresponsive to any input or action.

Blue Screens, Random Restarts, and System Crashes

Some other signs of a bad CPU include blue screens, random restarts, or total system crashes.

Your computer might simply shut down randomly in the middle of a game.

Weird Fan Behavior and Overheating

Another sign that your CPU might be dying is weird fan behavior or overheating during random tasks or while gaming.

Your PC fans might run at maximum speed, or the computer may shut itself down because the CPU is overheating.

If you're seeing high temperatures, you can compare them withnormal CPU temperatures while gaming.

Strange Noises and Visual Glitches

The last signs you may notice are strange noises or visual glitches that you might see in games.

If your computer has a built-in speaker, you might hear beep codes when you're experiencing a CPU issue.

You may also see random stutters in games or game-logic issues where your character might not be moving or responsive and then suddenly becomes responsive again after a short period.

What Causes CPU Failure?

Overheating

The first and most common cause of CPU failure is overheating.

This can happen if you're running the CPU under heavy load for too long and it stays at a high temperature throughout an entire gaming or work session.

Overheating can also be caused by:

• Dust buildup
• Blocking the vents
• Putting the PC in an enclosed space without access to clean airflow
• Dried-out thermal paste
• A bad cooling system

Any of these can make it harder for the CPU to stay at a safe temperature.

Power Issues

The next cause is power issues.

An unstable power supply or power surge can sometimes create downstream effects that affect the CPU.

You might also be experiencing inadequate power from the PSU, especially if you recently upgraded your CPU.

If you've experimented with overclocking, improper voltage settings in the BIOS can also cause CPU problems.

Physical Damage or Wear Over Time

CPU issues can also come from physical damage or wear over time, especially in an older system.

That physical damage could come from an accidental drop or too much pressure being placed on the CPU.

It can also come from manufacturing defects, like the issues experienced with some 13th- and 14th-generation Intel CPUs.

But sometimes the CPU will simply experience natural degradation after years and years of use.

Software or Firmware Issues

The final cause of CPU issues is software or firmware.

This could include a BIOS misconfiguration or malware causing unusually high CPU usage.

How Do You Diagnose a Failing CPU?

If you're having trouble getting into Windows or your operating system, the first thing to do is check your motherboard for a POST code or beep code, if the motherboard supports those features.

Newer gaming PCs often have motherboards with helpful POST codes that can tell you where an issue is occurring and whether the CPU is involved.

Next, monitor your CPU temperature with software such as HWiNFO.

You can also run CPU stress tests such as:

• Cinebench
• Prime95
• Intel Burn Test

These tests stress the CPU and push it toward maximum usage so you can see whether you experience the same issues that appear in games or other CPU-heavy applications.

If you have access to other compatible hardware, you may also be able to swap your CPU for a known-working CPU.

That can help you determine whether the processor itself is causing the problem or whether another component is responsible.

Otherwise, check the motherboard and power supply to make sure they're working properly.

How Do You Fix CPU Issues?

Cooling and Maintenance

The first area to address is cooling and maintenance.

You should clean out your PC regularly. That helps the system maintain cooler temperatures and can prevent the CPU from overheating in the first place.

You may also need to reapply the thermal paste between the heatsink and CPU if it's been a few years since you last changed it.

And if you've upgraded to a newer, more powerful CPU, an upgrade to your cooling system may also be necessary.

BIOS Settings and Power Stability

The next fix involves your BIOS settings and improving the power stability of your system.

Using a high-quality PSU that is rated for more than your computer requires can help provide stable power to the system.

A highly rated unit, such as an 80 Plus Gold or Platinum PSU, can also be a good choice for maintaining stable power to your system and CPU.

You can also go into your BIOS and reset everything back to the default settings if you've changed anything there.

That can wipe out misconfigurations you may have accidentally set.

You should also be careful about power fluctuations or other issues coming from the wall.

Using a good surge protector or battery backup can help provide clean power to your PSU, which then supplies power to your CPU and the rest of the system.

Software Fixes

There may also be some quick software fixes you can try.

Updating your motherboard BIOS to the latest appropriate version can be helpful because newer BIOS releases often contain fixes and updates that can improve compatibility or system performance.

Using good antivirus software can help remove malware or viruses that may be slowing down your computer.

Closing unnecessary background processes can also help improve overall performance.

When all else fails, you may need to do a system reset and reinstall Windows or your operating system to completely wipe out software misconfigurations that may be causing the problem.

When Should You Replace Your CPU?

Generally, you don't need to replace your CPU until you start experiencing major issues or it isn't performing nearly as well as you think it should.

Most modern CPUs can last for years and years, if not close to a decade.

You may want to replace your CPU if newer games become more demanding and have higher system requirements than what your current processor can handle.

You may also want to replace it if you're experiencing the issues above, you've tried troubleshooting them, and none of the BIOS configurations or resets have fixed the problem.

Sometimes, you'll simply need a newer CPU.

You might also just have an older system that you want toupgrade so you can get newer performance out of it.

When possible, replacing your CPU can be a cheaper and better fix than replacing your whole system.

While it's easy to get a completely new computer, you can sometimes find compatible used or older CPUs for less through places like eBay or Amazon

Written By William Wilson