G5 clicks but no LED / wont power on

Hi guys,
I recently replaced a G5 motherboard for a customer who had the hanging apple logo issue (I read about the issue and it looks like reballing was the best fix, but customer was willing to just get the mobo replaced).
I replaced, the board, put everything back together, and then, when I went to power it on PS would click on/off and the power LED would come on then turn off.
I tested the CMOS battery with a multimeter (the 1 1/2 AA size battery in this model) and it had about .3v (maybe just wasn't used in a while). To be safe, I put in the old battery which tested at 3.6v. Still nothing.
I took out everything and tried powering it on with just the power supply on the motherboard, still nothing. I put the OLD board in which used to turn on, and even that does not come on anymore.
PLEASE NOTE: I tested the power supply and compared it with a pinout, all voltages were CORRECT. When I put a pin between the green wire of the 24 pin connector and the 23rd ground pin, it clicks and the fans come on the PS.
Now, after trying it again, the front LED will not even come on. It still clicks on and off and sometimes when plugging in the power the LED might flash, but that's it.
All I can think of is maybe a bad power button? I don't know, i searched around and a lot of people just left it alone for a couple days and reported that it turned on afterwards. I'm lost with this one. Any way i can use a safety pin to manually power on the computer? If so, which pins do I touch together on the onboard power connector?
THANK YOU!!! I REALLY appreciate your help guys!

Well i found one issue,
the motherboard was not made for the liquid cooling processor so there was no connector for it. I tried using another similar connector but no go. gonna hold till i get the right mobo

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