Build won't post! Need Help!

[Itchyeyes]

Ok, so here's the scenario. Last night I did a build with the following components:

DFI Lanparty Jr P45 Motherboard
Intel Q6600
Visiontek HD4870
4GB (4x1GB) DDR2 800 G.Skill RAM
WD 640GB HDD
Antec P180mini
Corsair hx620w PSU

After I got everything assembled I tried booting up the system and it wouldn't post. Today I took everything apart and assembled it outside of the case to test all the parts. It booted up just fine several times. I reassembled everything inside the case in the exact same way I had outside (didn't plug any of the case wires into the motherboard). I tried to boot it and it froze at the exact same place it did before. I'm totally stumped here, does anyone have any advice on what I can do to fix this?

 

[Zetro]

It sounds like a possible grounding or shorting issue in the case itself

First things I would check are surrounding the case standoffs and the I/O shield. I have seen this happen when I installed a standoff into the case and placed the board over it as it was not a required standoff. It pressed against the board and caused it not to post and be erratic.

Second the I/O shield. Twice I have seen it not ground correctly against the board and cause some weird things to happen. Try taking it out and run it to see if that does it.

 

[Itchyeyes]

It sounds like a possible grounding or shorting issue in the case itself

First things I would check are surrounding the case standoffs and the I/O shield. I have seen this happen when I installed a standoff into the case and placed the board over it as it was not a required standoff. It pressed against the board and caused it not to post and be erratic.

Second the I/O shield. Twice I have seen it not ground correctly against the board and cause some weird things to happen. Try taking it out and run it to see if that does it.

Thanks for the advice. I took the board out of the case again and couldn't get it to start this time. I put everything back on my old board and it started up just fine. I guess I'm pretty certain at this point that it's a problem with the board, so I'm going to RMA it.

 

[engiNURD]

I know the DFI's from the 939 era had PSU issues -- they were very picky about which PSUs they would work with. I'm not sure if they still have that problem, but its something to look into.

BTW, there's a basic troubleshooting guide sticky, with a section for systems that don't POST. You probably did the same things it said, but the main question at the end of it is: what are the POST error beep codes you get with the different configs? (no ram/no vidcard, vidcard/no ram, ram/no vidcard, etc).