Computer will not boot. Receive message: strike F1 to retry boot, F2 for setup utility. typing F1 gives me same message. F2 will allow me into setup utility. Happened while installing software (ironically Norton Security 2002). LEDs read: ABC are green D is yellow. I get 2 quick beeps during boot phase, then error message. I checked BIOS configurations against factory settings... appear okay. Really stuck on this one!! Dell Dimension 8100 w/ XP. Any help is good help!