Either that's a really old PC or it is not sold in North America where I am. I cannot find support on Gateway's website. I did check their DX series but it offered no info on how to boot into the BIOS screen. When you first power it up, look in one of the corners for a command prompt to enter the "Set up" or "BIOS" screen. Usually it's something like F2 or F10.
If you can get in there, see if there's an option somewhere to do a hardware scan for errors. Sorry, but without something to go on in support, I'm pretty much blind here. I'll see if I can find something out there on info, but Gateway's website (in the US/North America) is of no help.