I pulled the side pannel off my comp last night to clean the dust off side fans. I somehow accidently unplugged the main hard drive SATA cable. Without knowing I tried to start my computer up and of course got an error message. I plugged the HDD back in thinking it should boot up fine this time. Boot up starts up as normal and goes to the ASUS Crosshair screen where you can enter Bios then goes to a black screen that states "Disk Boot Failure, Insert System Disk And Press Enter" My hard drives are all hooked up and I've gone into BIOS to make sure nothing changed. I even set boot priority to CD Rom and put Windows 7 system disk in. Every time computer turns on though I get same Disk Boot Failure message. I even tried using an older Vista CD hoping it might ask me if I want to reformat. Only thing I'm able to do is go into Bios and change things around, but cant figure it out.