4pin connector problem

[bartron]

Hi,

I have assembled the following computer:
P5W DH Deluxe mobo
Intel E6600 CPU
Corsair 2GB PC2-6400C4
Thermaltake Toughpower 550W
GeForce 6200 LE
250GB Seagate Baracuda
Floppy, optical drives etc.

Here's the problem:
The computer wont post. BIOS is rev is 1301. I double checked all jumpers. If I plug in the 24 pin and 4 pin connectors and turn on the comp, it turns off right away. If I just plug in the 24 pin connector alone and turn it on, then all the fans start running (including the GPU fan) and all PSU values are within spec even the 4pin connector (measured using DMM). I made sure all cards were set properly in their sockets.

I also tried running with one stick of RAM at a time and that didn't solve the problem. There are no beep codes, no nothing....just the fans (as long as the 4 pin molex connector is not in). The CDROM spins, the tray opens but there's no HDD activity (cuz of failed POST I presume).

My vid card doesn't require additional power btw.

Perhaps someone with experience can let me know if the problem is with the Mobo, or the CPU, or if I overlooked something or perhaps there's some compatibility issue. I know I need to have the 4pin connector hooked up, but there-in lies the problem.

I have also tried running the mobo with just CPU and memory. That didn't work either....the psu still turns off when the 4pin connector is plugged in.

Any help would be appreciated.

Merry Christmas!

 

[Peter]

The CPU lives off the 4-pin power, and of course the thing does /nothing/ when not powered. Beeps and such are also software driven typically, so none of those either.

Now, why does it turn back off when you /do/ apply CPU power? Maybe the power is too weak or out of bounds, or the mainboard's CPU circuitry is shorting the power supply out. CPU heatsink/fan mounting and connection is also a prime reason.

 

[bartron]

I will try rebuilding the whole system outside of the case later today just in case there's a short casued by the chassis. I will check the CPU/heatsink in the process.

Will post results later on.

As for the PSU, all values are within 2% of the required values. (ie 12.02V on the 12V line, 3.36V on the 3.3V line etc)

 

[bartron]

rebuilding didn't help. I'm going to take it in tomorrow to have it looked at.