4 pin ATX12V causing problems

[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 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!

 

[mechBgon]

The 4-pin ATX12V cable powers the CPU. So what you're saying is that if you don't provide power to the CPU, the rest of the stuff will stay running. Add a working CPU, and it shuts the system off immediately. So it's most likely there's something amiss.

Try taking the motherboard out of the case and laying it on cardboard. Give it just the bare minimum stuff needed to POST: CPU and heatsink/fan, video card, and RAM. No keyboard, no mouse, no extra cards, no drives. Does it POST like that?

 

[bartron]

I did that. It doesn't post.

I think its the Mobo. I don't have access to a 775 pin CPU that I know is working. I'll be taking it into the local comp store tomorrow.

Thanks for the help. I was hoping the solution was easy...and that it was something small that I overlooked...but I guess it isn't.

btw, if either the CPU or mobo is busted, is it a hastle to get the parts replaced or do I have to dish out the money for new ones. Both components are brand new and still under warranty. I used a grounding strap during installation.

Thx

 

[mechBgon]

The worst part about getting faulty parts replaced is usually the time lag. Sometimes it can take Asus 2-3 weeks to get you a replacement motherboard, for example. Where'd you get your mobo & CPU from? Some vendors will let you RMA the parts to themselves, instead of having to deal with Asus directly.