360 mod..... Ughhhh what am I missing here.

[Nitrosport]

I have an original 360 that I'm trying to put in a pc case with a pc power supply so I can use liquid cooling. I can't get the darn thing to turn on. I checked my connections 100 times and I checked to make sure I'm getting the correct voltages to the correct points on the board with a multimeter. Everything checks out but it wont turn on.

The power supply power ups, the other things connected to it work but the 360 is completely dead. If I turn the power supply on with the original 360 fan hooked up to the board, the 360 fans turn on and stay on but the 360 itself wont turn on

Any suggestions on what could cause this issue?

[Pikkon]

Have you tried using a 360 psu to rule out if the 360 is broken.

I installed a 360 in a pc case running off a pc psu and it worked fine,what are the watts for the psu your using.

[Nitrosport]

The psu is an ultra 650 watt. I ended up using another 360 board wired up exactly the same and it worked fine. Something must be wrong with the other (gamestop 100% refurb 360). I should have stopped the mod immediately when I took that 360 apart and found extra wires jumpered from the cd drive to the system fan

[Pikkon]

The wires you saw were to make the fans run at 12 volts,did you try to remove the mod then try the pc psu.

[Nitrosport]

I tried that but it still wouldn't work. Also, the fans wont work at all if I try to return the console to stock. Oh well, I'm almost done with the mod using the other board. Everything works fine, I just need to finish the cosmetics now. Here is a pic of what it looks like now:

[Pikkon]

Looks awesome Nitrosport

[Nitrosport]

Thanks I'll get a pic up when it's completely done.