Help with getting new build to post

[grimlykindo]

So I've been trying to figure out for a while what these troubleshooting results mean. With everything hooked up and plugged in the system turns on for about 5 seconds and then shuts off and then back on repeatidly until I turn the PSU switch off. If I unplug the 4-pin 12v ATX at the top of the mobo the system turns on and stays on - no beeps or anything on the monitor (Just fans spinning). I've reseated everything and tried with all compenents in and out including memory and HDs. The only thing that seems to make a difference is the 4-pin 12v plug. I stumped on what it could be - bad PSU? Here is the hardware:

Gigabyte EP43-DS3L mobo (775,DD2, PCIExpress)

Intel Pentium 4 3.0 775 (Yes it is on the compatibility list for this mobo on Gigabyte.com)
^TEMPORARY^

Corsair XMS 2 800MHZ DDR2 2x1GB

OCZ 700W StealthStreaM

EVGA 7800GT

 

[zerocool84]

You reseated the cpu as well?

 

[Slugbait]

Originally posted by: grimlykindo
If I unplug the 4-pin 12v ATX at the top of the mobo the system turns on and stays on - no beeps or anything on the monitor

That's by design...you're not providing power to the actual problem any more.

It's possible the HSF mount was done incorrectly...if the CPU heats spikes dramatically at boot, safeguards on the mobo prevent boot to save the proc. Clean up the paste or whatever you used, apply some more as instructions say, and be sure to mount the HSF carefully.

Otherwise, I would suspect the mobo.

 

[KGB]

Originally posted by: Slugbait

Originally posted by: grimlykindo
If I unplug the 4-pin 12v ATX at the top of the mobo the system turns on and stays on - no beeps or anything on the monitor

That's by design...you're not providing power to the actual problem any more.

It's possible the HSF mount was done incorrectly...if the CPU heats spikes dramatically at boot, safeguards on the mobo prevent boot to save the proc. Clean up the paste or whatever you used, apply some more as instructions say, and be sure to mount the HSF carefully.

Otherwise, I would suspect the mobo.

Besdides checking the heatsink, check that the CPU fan is plugged into the correct pin header. By design, if the BIOS doesn't sense the fan is spinning the MB will shut down.

 

[grimlykindo]

Ok guys - after scouring the website and booklet that came with the gigabyte mobo I'm pretty sure the P4 cpu I am trying to use is not compatible with this mobo. On the website its on the compatibility list but where is says what bios you need for the Pentium 4 - it says N/A! It must be too old of a 775 cpu - it is a Prescott...
I've aleady ordered a core duo from newegg - thanks guys!