PC won't power without holding reset and power on case

[eGeeked]

I have a custom build that is about a year old. (specs below) For some reason for as along as I can remember if I shutdown my pc and attempt to press the power button to turn it back on, it will send a little power (the fans will move slightly) then turn back off. It will do this only once then there is no reaction from any moving parts when I press the power button. To get it to power on I have to flip the power supply switch, wait 10 seconds, hold the power and reset buttons at the same time and then flip the psu switch.
I have tried all of the following remedies:
upgrade BIOS via USB flash and windows exectuble
downgrade BIOS via USB flash and windows exectuble
new case (thinking there is a short with the button)
new PSU (same issues)
disconnecting all extra drives (thinking it might be related to undersized PSU)

I am unsure what to do next and I turn to you. Thank you for helping me out here, I am stumped.


Windows 8.1
PowerSupply - EVGA SuperNOVA NEX650G 80PLUS Gold Certified ATX12V/EPS12V 650W Power Supply
2x Video Cards - GIGABYTE GV-R667D3-1GI Radeon HD 6670 1GB DDR3 DVI-D / D-Sub / HDMI CrossFire Ready Graphics Card
SSD - Kingston HyperX 3K 120 GB SATA III 2.5-Inch 6.0 Gb/s Solid State Drive SH103S3/120G
Processor - AMD FX-8150 8-Core Black Edition Processor Socket AM3+ FD8150FRGUBOX
Heatsink - Cooler Master Hyper TX3 - CPU Cooler with 3 Direct Contact Heat Pipes
Motherboard - GIGABYTE GA-990FXA-UD3 AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD
Memory - Corsair Vengeance 16GB (2x8GB) DDR3 1600 MHz (PC3 12800) Desktop Memory
Case - Antec One Computer Case
2x DVDRW
1x BluRay

 

[Onus]

Disconnect the power and reset buttons, and use a paperclip to short the power pins to turn it on. Does that work?

 

[eGeeked]

GOT IT! I went to the oldest BIOS available for this board and that was the problem. How annoying.