Black Screen + Buzzing Sound From Speakers, Sometimes Stuck At BIOS SCREEN

[recreativos]

My PC operating on Windows 7 started sometimes getting stuck at bios screen with nothing to do but a restart which solved the problem since I guess about a month ago and resulted with a black screen and a buzzing sound from the speakers a few times while gaming, 2 of 3 of which are not demanding games for this pc by the way, within the last a few days I think after I updated my gpu driver to the latest one, I also heard a 1 second or less buzzing sound 2 times while gaming today.

I simultaneously ran Prime 95 blend cpu stress test and Kombustor gpu stress test and the PC froze after about half an hour.
I consider turning back to older gpu drivers and running a memory test next but I still don’t have much of an idea what problem/s the pc may have.

The PC specs are as follows:
Gigabyte GA-P43-ES3G motherboard
LGA 771 to LGA 775 mode Xeon E5450 which used to run with 20% overclock but I turned it to stock settings I think about a year ago
Everest Rampage RMP-600-80P active pfc 80+ 600W psu
Nvidia Geforce 750 ti Galaxy OC 2GB edition running on 240 mhz core clock and 590 mhz memory clock overclock with MSI afterburner
4 800 MHz 2GB sticks of Kingston Ram
Samsung 850 Evo 500 GB SSD
External HDD
Bloody Gaming keyboard which becomes irresponsive if the pc asks whether Windows should do a normal startup after an abrupt reset
Bloody Gaming mouse

Please help if you can

[recreativos]

The PC started to have stability problems before turning the cpu back to stock settings

[Rustys]

LGA 771 to LGA 775 mode Xeon E5450 which used to run with 20% overclock but I turned it to stock settings I think about a year ago

You may have done damage to the mother board and the CPU.

I agree with what other have stated on the other forums that you have posted this on time to replace.

[recreativos]

You may have done damage to the mother board and the CPU.

I agree with what other have stated on the other forums that you have posted this on time to replace.

I used the cpu modded and overclocked for years so I think it’s probably not that.