Won't be whats stopping your computer booting up, but might as well hook it
up. The 3rd pin is for determining the fans speed, one is + the other -
check your mother board manual before frying the mother board.

It won't turn off because the power down driver hasn't been loaded, I
would point to a mother board fault. A loose connection somewhere
would point to this fault as well, try pushing every connection into
place. If this doesn't work try resetting the BIOS, to do this check
your motherboard manual. It will involve moving a jumper round on some
pins, turning on the computer resetting the jumper then restarting it.


Thanks for the reply. There is one loose wire with a 1 cm X 1 cm white
one female pinjack connector that goes to (i think, hard to see) the
power supply fan. I don't know if this was loose before the move. There
are two connectors on the board labeled power CTRL/RPM Fan 1 and Fan 2,
but I don't think these are the mating connectors because one of them
has a 3 wire connector and the other also has 3 pins and the loose wire
only has one pin.

I don't have the MB manual, but I may be able to download it from Dell
site, have to check.



Dell XPS 800, was working perfectly before a move.

Need your help with diagnosis, here are the symptoms, when turning it
on:

green power light comes on, hard disk normal sounds for about 1-2
seconds.

No beeps, blank screen (not even a cursor).

Box will then not turn off at front power switch UNLESS I hold it for
7-8 seconds, then powers off.

Looked inside and found no obvious signs of damage or loose boards.

Any ideas? (Don't suggest dell support they did not reply to my
inquiry).