I'm trying to fix a hard drive problem my father was having, which he says was basically a "No Hard Disk found" kind of problem in boot-up. When I put his Master drive (WesternDigital Cavier EIDE 80.0GB) into my machine (Intel 2.0Ghz W2000, etc.) as a slave, it's recognized no problem and it tests fine with WD's diagnostic software. However, when I replace it in his machine (which has the same motherboard and Intel processor) it intermittantly recognizes the S/N of the hard drive in the BIOS setup, or sometimes it doesn't even do that, but when it actually tries to boot it hangs for a few seconds (after recognizing two CD-ROMs on the other cable) before saying no hard disk was found. It seems like I've had this problem before, and the fix was so simple I forgot what it was. Do I need to have a more up-to-date patch cable (80-pin, not 40-pin?) for this drive to work properly? Am I missing something? My next step would be to swap out the patch cable on my other machine to see if that would make a difference. But I'm at a loss. I've tried the obvious stuff, and need your help. Thank you.