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i. Booting issues: In the event of a CPU failure, it won't go through the normal process of booting. When you start the computer, you won't hear any beep codes since the POST test is not passed. The only thing you may hear is the fans running. Apart from that there will be just a blank screen displayed. No matter how many times you press the keyboard
keys or click the mouse buttons you won't be able to get any response from the PC. You can further confirm this by looking at the motherboard LED's. If the LEDs happens to light up when you turn on the PC but the system doesn't pass the POST test, it is an indication of a processor failure.
ii. Frequent shutdowns: A Processor that is more subjected to heat is more likely to undergo failure. In nature CPUs generate more heat which is dispelled by the fans. If the fans get clogged with dust and other particles, it will not be able to expel this excess heat out. As a result, the processor can get overheated to the maximum level that is not bearable. So, for preventing further damages to the processor the motherboard takes necessary actions to shut down the PC.
iii. Beeping noises: Every computer at its startup runs a self-test known as POST. This test verifies if all the PC components are functioning properly. If this test happens to encounter any problems in the CPU it will indicate through a series of beep tones.
Through the number of beeps, you can identify whether the problem is related with the processor. Usually, the beeps are given 5-7 times if there are any issues with the CPU.
iv. Physical damages: Generally, a bad CPU can be identified through its external appearance. If the processor is exposed for heat for a long time, it can get damaged permanently. Besides that, there can be charred marks left over on the CPU. You may
also notice burn marks around the CPU socket. In this type of cases the damages are more severe and irreversible. The only thing you can do about it is simply replace them.
v. Freezing: Another symptom that generated from a CPU failure is the random freezes happening when using the system. This can happen right after when you have logged into the operating system. In this event the computer could become completely unresponsive. No matter how many times you press the keys, you cannot get over this until you restart the system.
vi. Blue screen of death: A PC generally displays Blue Screen of Death error when it encounters a severe damage that it cannot recover. The reason behind this error can be anything from a bad RAM, Motherboard or a CPU. Literally if the issue is with the CPU, the BSOD will be displayed along with the code 0x00000.
Kavungya answered the question on September 1, 2021 at 04:58