my harddrive will not boot up

You cannot 'reset' a hard drive. Perhaps you meant reformat/format.

If your hard drive is not booting the system, here are a few simple things you can do.

Double check in BIOS that your drive is being recognized and that it is list in the boot priority list. Sometimes random electrical buggies zap out bios settings.

If you don't see the device listed, maybe your drive has become faulty. Try to listen for abnormal whizzes and clicks coming from the hard drive.

Open your case up, make sure cables are firmly connected, perhaps while you are there try a different power connector. I've seen people kick their systems in frustration, knocking a few things out in time.

Before going into all those steps, simplest troubleshooting is 1. make sure bios see's the drive, if it does, 2. pop in your windows CD, go to recovery console and do a chkdsk /r. Simple errors will be corrected and if you have multiple bad sectors, good indication your drive is shot. Purchase a new one.

If chkdsk completes with no bad sectors and still a problem booting up, try going into safe mode by hitting the F8 key upon booting. If you make it to safemode, do a system restore back to known working date, uninstall anything recently installed to rule out that possibilty.

If you cannot make it to safe mode, boot from your windows CD and try a repair install. All documents/programs will be there, you will just have to go online and reupdate your Windows again.

Consult with your local IT professional for any data recovery purposes if none of the solutions work and/or if you have valuable data and have no IT experience.. better leave the rest to a pro.

Best Wishes.