Hard disk not detected after formatting bootcamp partition

I am using rEFIt (with OSX, Fedora 13, and Windows7) on my MacBook. I formatted the BootCamp partition (Windows7) using DiskUtility because I wanted to revert back to WindowsXP. After reformatting I rebooted my MacBook but I cannot get to see the rEFIt options. I used the Installation DVD that came with the MacBook, opened DiskUtility and I cannot see my hard disk on the available disks. Need help badly... Thanks!

The tests from the Assistant are not as comprehensive or reliable as the full hard drive test in the BIOS....tap F10 as you power up, go in there and find the hard drive test. Run the long form test and see what is says. It is not unusual for hard drive issues to start as intermittent and gradually get more frequent. If your drive passes the long form test you can fairly safely assume it was a one-time gremlin of some sort, but it is still a real good idea to back up. I like the idea of the online backup services and I will name Carbonite only because it is well known and not as an endorsement. There are several more and an external drive is also a good idea.
You cannot put off a reboot forever; you are going to have to confront the issue at some point.

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