I have got this Dell Optiplex GX280 of a mate who's dad works at phillips. It worked fine originally but then after a while it shut off. Now you see this isn't shutting down, the display turns off and when the case speaker is enabled i just get a lot of crackling.
The HDD LED Activity light shows that the HDD is still functioning and everything inside is fine nothing smells of burning, or anything. The logs on both bios and windows show nothing significant apart from a Keyboard Failiure at boot. I have tried many things.
It will sometimes boot up fine and stay on and working perfectly for hours but then others it will not work at all or work for 10 mins and then stop. Totally random intervals. I used to be able to get into safe mode on the computer but that doesnt work anymore, but when i did that it never crashed.
I am thinking possibly the CMOS Battery but it is unlikley seeing as there are no erros in the boot logs.
Any help would be greatly appreciated as i have been tearing my hair out for weeks over X-mas about this and every time i think i have solved this it stops working again.