So ive had this problem for a long time i will start at the beginning. i started to build a pc. i had the psu a gpu ram and a case. but i ran out of money and my frend was getting a new pc so he decided to give me his old one, it was a asus essentio cm6870 pre-built. he gave me the hardrive mainboard a gt 620 that came with it and a case. i put it all in my new case and booted it with the gt 620 and it posted and ran fine. then i upgraded to the rradeon hd 7770 and i had tons of isseus with it. it wouldent post, wouldent go to bios or wouldent boot every time. it took 2-5 trys to boot. and one day i shocked my pc and the 7770 stoped working. so i got a new 7770 and it dident work eather it just went to this flashing light gray screen. then i got a nvidea gtx 660 and it booted every time but dident post. now when i try to go to bios it just black screens and then after about a minite it makes a click sound and just stays black. it works but when i go into system settings it still thinks it is a asus essentio cm6870. is there anyway to get rid of the factory settings so it thinks its just a plain motherboard. btw the motherboard is a asus p8-h77 m-pro. i just put the 620 back in and it posts and everything.