No bootable device -- insert boot disk and press any key

[fibao]

I dont know where it came from, pc worked fine yesterday now when i boot it says No bootable device -- insert boot disk and press any key

Pls help

I loaded system restore and that didnt work either

[djjkxbox360]

Check in BIOS that the hard drive is set as the first boot device and make sure there aren't any CDs/memory sticks/memory cards plugged in