I'm running a Pentium 266 with a noisy fan. In trying to fix, and possibly replace, my fan I unscrewed it and fiddled with some of the connectors. When I restarted my computer, the Primary Master (a 20GB HD) was not detected, but my Prmary Slave (a 6GB HD) and both my seconday master and slave (CD ROMs) were detected. I tried resetting my BIOS default settings, auto-detecting my drives, and such, but to no avail. So I switched the Pr. Master and Slave, and now it's not detecting either the 20GB or 6GB HD. Right now I'm praying that I have not ruined either HDs. Can anyone help me?