New build PC - no power. Any help appreciated!

[judgedoug]

Hi everyone,

I recently ordered lots of parts for a new computer.
P4 631 Cedar Mill 3.0 ghz
Epox SP-945J mobo
2 x 1 gig PC-5400 ram
XFX Geforce 7600 PCIX16
SATA 160gb HDD
PATA DVDRW
480 PSU

I've built several computers over the last year, all which work just
fine. However, I'm having some odd problems.

I put in the mobo, attatched the cpu and heatsink, put everything else
in, all jumpers, etc. No problem. Then, no power.

So I disconnected everything and tried it with just the PSU, mobo and
CPU. No power.

So, I'm thinking, either bad PSU or mobo.

But, here's the thing I noticed:

Keyboard and optical mouse connected. CPU, PSU connected to mobo.
Toggle the ATXOn with screwdriver while flipping the PSU's power
switch. The keyboard flashes it's LED's and the optical mouse's red
light comes on. But, no power anywhere else - no fans, no LED on the
mobo, etc.

So I tried my 550 PSU from the computer I'm using right now. Plugged
that in, same power cable, same receptacle. Same thing. No power, but
I do get LED's on the keyboard and the optical mouse's red light.

I tried clearing the CMOS jumper, just in case, several times, but to
no avail. I even popped out the CPU and heat sink and reinstalled them
just in case. Played with the 24 pin and 4 pin power connections to
the mobo - they're all tight.

Unless someone has a good idea, I'm thinking about RMAing the mobo. I
like all the specs on it, so I'll see if Newegg or whomever will swap
it out for another. But before I have to deal with lots of shipping
time, I'd like to see if there's something I'm not doing right or
whatever.

Any help, any ideas, would be much appreciated!
Thank you all!

Doug

 

[Dave]

Hi everyone,

I recently ordered lots of parts for a new computer.
P4 631 Cedar Mill 3.0 ghz
Epox SP-945J mobo
2 x 1 gig PC-5400 ram
XFX Geforce 7600 PCIX16
SATA 160gb HDD
PATA DVDRW
480 PSU

I've built several computers over the last year, all which work just
fine. However, I'm having some odd problems.

I put in the mobo, attatched the cpu and heatsink, put everything else
in, all jumpers, etc. No problem. Then, no power.

So I disconnected everything and tried it with just the PSU, mobo and
CPU. No power.

So, I'm thinking, either bad PSU or mobo.

But, here's the thing I noticed:

Keyboard and optical mouse connected. CPU, PSU connected to mobo.
Toggle the ATXOn with screwdriver while flipping the PSU's power
switch. The keyboard flashes it's LED's and the optical mouse's red
light comes on. But, no power anywhere else - no fans, no LED on the
mobo, etc.

So I tried my 550 PSU from the computer I'm using right now. Plugged
that in, same power cable, same receptacle. Same thing. No power, but
I do get LED's on the keyboard and the optical mouse's red light.

I tried clearing the CMOS jumper, just in case, several times, but to
no avail. I even popped out the CPU and heat sink and reinstalled them
just in case. Played with the 24 pin and 4 pin power connections to
the mobo - they're all tight.

Unless someone has a good idea, I'm thinking about RMAing the mobo. I
like all the specs on it, so I'll see if Newegg or whomever will swap
it out for another. But before I have to deal with lots of shipping
time, I'd like to see if there's something I'm not doing right or
whatever.

Any help, any ideas, would be much appreciated!
Thank you all!

Doug

Remove the motherboard from the case and try it setting on cardboard. The
only boards I've seen that were that dead (brand new) were shorted to the
case somewhere. -Dave

 

[judgedoug]

Nope. Just tried it on cardboard, PSU hooked to mobo, connecting the
ATXon with a screwdriver. Nada. No internal mobo LED or fans.

 

[Dave]

Nope. Just tried it on cardboard, PSU hooked to mobo, connecting the
ATXon with a screwdriver. Nada. No internal mobo LED or fans.

Yikes. Sounds like mainboard is dead as a doornail. -Dave

 

[judgedoug]

Thanks for the confirmation. Back to Newegg it goes!

 

[Paul]

Nope. Just tried it on cardboard, PSU hooked to mobo, connecting the
ATXon with a screwdriver. Nada. No internal mobo LED or fans.

No internal mobo LED, means the PSU is not delivering +5VSB. That
could be either a PSU failure, or a motherboard that is shorting
or overloading the +5VSB.

I would get a jumper, and connect PS_ON# to COM on the power
supply. Check to see that the PSU fan spins. That is a quick way
to tell whether the PSU is completely dead or not. If you want
a dummy load for the power supply, you can connect a couple
old disk drives to a couple Molex connectors. (Check the label
on the power supply, to see if it specifies a minimum load
value.)

http://www.adnpc.net/dossiers/54/lire.php?pg=1

If the PSU fan spins, that tends to suggest the motherboard.
If the PSU just sits there, even with the jumper in place
and the switch on the back of the PSU in the ON position,
then you should be returning the PSU instead.

Paul