last time i checked, gateway BIOSs sucked, really bad. I am on an old PIII gateway until I get my MOBO back from ASUS, and I stopped trying to get in to the BIOS.
Also, I would say get a new HD, since the old HD in the gateway im on right now started making clicking noises, and less than 2 months later, it was dead completely. I think the "click" is when the HD does something/encounters an error and resets the read/write heads back to the inside of the disks, and overshoots into the spindle. I opened the HD right before it died after I received my new one, and that was what it was doing.