Theres a weird problem with my pc, it was working fine till i thought of taking out the vaccum cleaner and cleaning the whole pc, i opened the cabinet and took off the hdd's ide cables, cleaned the cab and closed. But when i tried to boot the pc it gave me the boot failure error. I thought it was because of loose connection of the ide cable, but everything was fine and secure, it happened to me before 2-3 times whenever i cleaned the pc disconnecting the ide cables and taking out the hdd, so just when i was experimenting everything possible an idea came into my mind and i placed the hdd in its slot upside down and it worked, afterwards i tried placing in correct position, but to my dismay it again gave the boot failure error. Wats the prob?????