CPU gone bad?

[chintan.vismay]

Hi!,
My computer running Win 10 was rebooting with a click sound randomly.Sometimes it would go into a reboot loop. I changed components from an older pc and it stopped this behaviour when I swapped the AMD FX6300 black edition processor it had with a AMPD Phenom2 X2 550 processor. So, my query is , has the processor gone bad? If yes, then why doesn't it behave like this when i am in BIOS or when I am installing Windows? This happens only after running for sometime. Could it be because of the power supply? But for 3-4 years it had the same power supply...My specs of the system are
Gigabyte GA-970A-DS3P (rev1) Motherboard
AMD FX 6300 Black edition
Corsair 2*8 gigs of ram
AMD Radeon HD 5450 GPU...
Corsair VS450 psu
I was first suspecting the GPU, but since I didn't have a spare GPU I coudnt check it. The motherboard is an ATX kind and doesn't have onboard Graphics. Also shall I try underclocking the processor and running it or is their a way to block any of the cores and using it,if they have gone bad?

 

[CountMike]

Did you upgrade BIOS to last one ?
How about temperatures under load ?

 

[chintan.vismay]

Thanks a lot for ur reply!No, i haven't updated the BIOS. Maybe overheating is not the issue as i have been using a Cooler master cpu cooler that has a quite large heatsink and copper tubes...I dont remember the model no. but i can look up. Also, its just usual internet usage or playing music that i have been doing. Also, fearing a cpu overheat i had just a fortnight back applied thermal paste to the heatsink and the processor. Its a digital audio workstation and has worked fine for last 3-4 years and i had checked the temperatures a few days back with GPU-Z program (if i remember correctly) and it wasn't too high. One thing i forgot to mention is that when this incessant random shutting up kept happening and i took the cpu off to apply thermal paste. I had forgotten to plug in the cpu fan power supply. It was nighttime and quite cool and the pc ran for about 3 hours and then suddenly shut down. That time the cpu had gottrn quite heated up. But i had switched it on again after it had properly cooled down and it ran fine for a a day or two then went back to the same behaviour. It would just make a"tick" sound and reboot. Sometimes it would just run fine for maybe an hour then randomly do this.This has been happening since last six months or more and first i thought its some malware etc... it would happen just every 7-8 days once or twice then the frequency increased. I plugged in a hard disk with Lubuntu 18.4 installed which is a very light os (as far as i know). But this issue remained. Maybe i t must have been going bad slowly which i have hastened by forgetting to plug in the cpu fan.

 

[CountMike]

AMD Overdrive https://www.techspot.com/downloads/4645-amd-overdrive.html would give you better picture of what is happening as well as testing. Look for temperatures and not only of the CPU and voltages for all components.
Maybe stupid question but did you reset CMOS/BIOS since updating CPU ?

 

[chintan.vismay]

Ohh. No, i havent reset it. I will do it. i changed to phenom just today and it has been running fine. I will check and install AMD overdrive. Thanks again