It seems as though your BIOS perhaps got flattened out, and the boot order is wrong. If I am talking a foreign language right now, then take the PC to a technician. IF not, then get into BIOS and verify the boot order. The next thing, is if you were to select the disk that it offers, does it boot? If not, then the DISK the BIOS is referencing is bad! Once again, take it to a technician!