|Please list motherboard make and model.|
Please list how many hard drives, type and brand.
If you have 3 hard drives and all are SATA drives, you may need to simply reset your bootable drives in your BIOS as well as resetting the boot order (not the same). You need to designate only your primary hard drive as bootable in your BIOS and then make sure that your boot order is CD/DVD drive 1st and your Hard Drive (primary) second (if you still use a floppy drive then Floppy/DVD/Hard Drive). Use the SATA connector number, hard drive brand/model numbers, or capacity (disk sizes) to tell the differences between the drives when setting the bootable drive. You should only list more than one hard drive as bootable if you have a multi boot system with a different operating system on each drive.
Your motherboard model and other details you may supply may change or add to the above.
You have to be a little bit crazy to keep you from going insane.