i just bought a new motherboard and a new cpu for my computer and its the first time i try this. when i put everything together and set to optomized setting it WONT post. i tried without the opt setting too but still didnt work. after the BIO it loaded things up and takes me to a menue where you choose to run safe mode, last known good configeration and start computer normally. i tried all of them but it just takes me back to setting again....so, any suggestion? i dont have anything to help cuz i just moved....  Do you still have Windows on the hard drive from a previous installation with a different Mobo and CPU? If so I would recommend a TOTAL reformat and reinstall. That might solve this problem easily AND prevent multiple other ones down the road.

that was what others told me. how do u reinstall OS? does system recovery cd work?Yes, but backup any data files first. You need to format the drive and reinstall, and a recovery disk usually does just that.How i do that when i GET get to the window?i put the system recovery cd in and  i tried to use the bio to boot the cd rom but it say "Erro! PC System not SUPPORTED".....I suspect you will need a real OS disk.