I have a computer with 2 SATA HDD and an
abit KN9 motherboard.
If I set the CMOS jumper to the
clear position, and if I disconnect one or both of the HDD, then my computer powers on --- at least it doesn't power off, I get no beeps or BIOS screen etc, but the lights and fans stay on.
If both of the HDD are connected, the position of the CMOS jumper doesn't matter, the computer lights and fans power off within 1-2 seconds.
If just one HDD is connected, then when the jumper is in the
clear position: no boot, but lights and fans remain on. With the same single drive connected, putting the jumper to the
normal position kills the power on within 1-2 seconds. This situation is true also when it is the other HDD solely connected.
If no HDD are connected, we have lights and fans indefinitely (but no BIOS or OS) when jumper is set to
clear position, and power off within 1-2 seconds when CMOS jumper is in
With no HDDs and no RAM I get
beeeeep beeeeep beeeeep (my BIOS is Phoenix AwardBIOS) and then shutdown the first time, but sometimes I get no beeps, other times I get an endless number of long beeps, so it seems somewhat variable.
Any ideas what the issue could be? I've tried the obvious things like loose cables, re-seating the RAM and CPU. I'm thinking perhaps the PSU needs replacing?
EDIT: So I now think the CMOS jumper setting was just coincidental; it seems that the behaviour alternates between power ons. The first time I might get fans and lights (no POST) indefinitely, the next time I will get fans and lights and then dead after 1-2 seconds and so on....
I also checked for
bulging capacitors --- there aren't any.