The PC's bios is not saved. After I changed the PC's bios and gave save and exit, the PC restarted and the PC runs fine again. I shut down the pc and unplugged it and after 5 minutes I plugged it back in and turned on the pc and then the pc turned on and then the pc turned off and the pc restarted. But nothing is saved in my pc's bios. Someone who knows how to give me a solution to this. A big help