"1.Computer off, and unplugged from the surge protector. Press the Power On button, and hold it in. Hold it in for a count of FIVE seconds. (FIVE. You can go a few more. Count, 1001,..1002,..1003,..1004,..1005)
Let go of the Power On button. DO THIS TWO more times.
Plug the computer back into the surge protector. WAIT Two minutes. Turn the computer on.
What you are trying to do here, is clear the CMOS error codes, and reset your BIOS Setup options back to the factory default settings.
2.Go into BIOS Setup, and see if your harddrive is recognized. IF not, set it to -> Auto Detect. Restart your computer, and see if it will boot up.
http://www.fluteloop.com/PCHC/bios The above gives you an idea of what you will see when looking at your BIOS Setup. (Older computers called it -> CMOS Setup)
3.OR, if you feel you don't want or can't do this, and have the Full Installation disk for your computers Operating System, (Windows XP is an example of an O/S), OR you have the Restoration Disk, just pop it in your optical drive, (CD/DVD drive), and away you go!
You still, May have to set CDROM, as the first boot device in Boot Order, in your BIOS Setup.
http://www.fluteloop.com/PCHC/bios"
Source:
http://answers.yahoo.com/question/index?qid=20090309232204AA7Il8L