I've never heard of a virus that can cause a working bios to not see a working drive. Probably a hardware failure - either the drive or the eide controller. Try moving it to the other side of the controller, and try swapping it with a known good one. >My hard drive has recently stopped booting. It still powers up but is >not detected by bios. A friend suggested that it could be a hex virus, >but I can find no info about this no the web. - Users can unsubscribe from this list by sending email to 24hoursupport-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field OR by logging into the Web interface at http://web.tampabay.rr.com/spider1/24hrsupport.htm.