PSU Problem

[Steve W]

I thought I had a PSU problem so I bought a 500W Akasa as a replacement for
the unbranded 450W supply.

The Motherboard is a P4V800D-X and is loaded with a 2.6GHz Pentium, single
250G SATA 1GB RAM and a couple of DVD drives. The video card is a 6800GS
from Gigabyte.

With the AKASA installed everything lights up but the SATA drive doesn't
spin up and there is no video. The DVD drives power up and the drawers will
open and close. CPU fan (Coolermaster) powers up and the fan speed is
controllable off the pot.

Without immediately jumping to the conclusion that the new PSU is duff, I
put the old power supply back in and everything powers up again normally.

The only difference being that the AKASA actaully looks like someone took
care of the build and was prepared to put their name on it and secondly it
has a single 24pin ATX Mobo plug instead of the 20pin + 4 pin arrangement of
the original. Is it likely that the mobo which has a 24pin and a 4 pin
socket isn't compatible with the 24pin plug?

The only other conclusion is that the PSU is duff at which I'd be gutted!

Any other likely answers apart from DOA PSU?


TIA

Steve

 

[Rod Speed]

I thought I had a PSU problem so I bought a 500W Akasa as a
replacement for the unbranded 450W supply.

The Motherboard is a P4V800D-X and is loaded with a 2.6GHz Pentium,
single 250G SATA 1GB RAM and a couple of DVD drives. The video card
is a 6800GS from Gigabyte.

With the AKASA installed everything lights up but the SATA drive
doesn't spin up and there is no video. The DVD drives power up and
the drawers will open and close. CPU fan (Coolermaster) powers up
and the fan speed is controllable off the pot.

Without immediately jumping to the conclusion that the new PSU is
duff, I put the old power supply back in and everything powers up
again normally.
The only difference being that the AKASA actaully looks like someone
took care of the build and was prepared to put their name on it and
secondly it has a single 24pin ATX Mobo plug instead of the 20pin + 4
pin arrangement of the original. Is it likely that the mobo which
has a 24pin and a 4 pin socket isn't compatible with the 24pin plug?

The only other conclusion is that the PSU is duff at which I'd be
gutted!
Any other likely answers apart from DOA PSU?

Can you measure the 12V rail with a multimeter ? Its certainly possible
to have a fault that sees that well down on voltage or with a lot of ripple
due to a failed rectifier diode on that rail and still spin the fans up, but
not the hard drive. The Vcore is regulated from the 12V rail so it may
not be so bad that it cant still produce the Vcore voltage.