|"My son tried downloading sheet music and system locked up.|
System would not reboot."
Apparently your model is a laptop.
Gateway MX6920 Notebook
Assuming you mean the computer isn't starting up at all, your inabilty to boot the computer may be because the battery is defective or is too discharged for the computer to run on the battery alone for whatever reason.
Laptop no video (or video problems), and battery, AC adapter, power jack T shooting.
See response 1:
If you mean Windows won't load properly, but you are seeing video while booting before it's supposed to load, your computer is booting fine ! Your problem is Windows is not loading from the hard drive properly !
Make sure your hard drive is okay.
If it isn't you're wasting your time doing other things and you need to do other things with that in mind.
Test your hard drive with hard drive manufacturer's diagnostics.
Seagate's SeaTools will test (almost) any brand of hard drive.
Do the long test.
The Dos bootable versions of SeaTools can test the hard drive when Windows will not load properly, or even when the drive has no data on it.
It the drive itself passes the test, any data problems on the drive can be fixed one way or another.
Modern Gateway computers do not come with Recovery CDs.
A Recovery disk for a different brand name computer model will usually NOT work on your model !
There may be Recovery disks available for your model, or not:
BEFORE you install Windows or the original brand name supplied software installation from scratch, you can use something that has an operating system on it that recognizes all the files on the drive to boot the computer with, then you can copy all the personal files you do not want to lose to elsewhere.
e.g. make yourself a bootable Linux CD or make something such as the Ultimate Boot CD.
If you can't do that on your computer, remove the drive and connect to another computer but don't boot from your drive on the other computer !
(XP probably will not load all the way from your hard drive if you doo that in any case - that's normal.)