EVGA 790i FTW MoBo POST Problem

[Essence_of_War]

Short: I've got an Intel Core2Extreme on an EVGA 790i FTW ATX Motherboard that spins up the fans, but then hangs at the "FF" POST code, and dies.

So far:
1) I'm sure that the CPU is correctly seated, because this was running fortran simulations for me just a few days ago.
2) Stock CPU Cooler - is securely attached, spins up at power-on, and 4pin connector is connected, detached, and reconnected with no change.
3) Checking and re-checking the 4-pin CPU power connector and the 24pin ATX connector. No change.
4) Resetting CMOS jumper.
5) Removing and replacing CMOS battery.
6) Checking the seating of the BIOS chip.

I've also checked:
1) Voltage setting - the PSU is older, but there is no 110/220V selector that might have been flipped
2) Motherboard standoffs - I don't think a stand-off short is likely since the board has been in the case, working for several years.

From what I've seen from EVGA, it sounds like the differential is likely to be dead/dying power supply at this point? I don't think I have access to a known good psu, unless I could scavenge one from one of our to-be-recycled older Dell boxes. The current PSU is a rosewill rated for 950W, but with the Tesla gpu removed, I think a 300ish watt Dell unit should be able to handle a non-OC'd CPU/MoBo/RAM, and a 9500 GT gpu, right?

Other than PSU, what should I check next?

 

[Burpo]

"The 790i FTW Digital PWM Motherboard (132-YW-E180-A1) has a tiny dip switch near the CPU socket towards the top of the motherboard. This switch toggles different power modes for your CPU. Leave the switch to the "1" position for Core 2 processors and above (Core 2 Duo, Core 2 Quad, etc.). For Pentium 4 or older processors flip the switch to the "ON" position. If this switch is set to the incorrect setting the motherboard will not POST and result in the motherboard going straight to the "FF" POST code without cycling through other POST codes. If the board doesn’t post and goes to FF automatically turn the machine off, flip the switch from the 1 to the ON position, and see if it posts"

If you've tried all these different things and no change, your EVGA board probably died or has bad cap(s).

 

[Essence_of_War]

Yeah, I've tried all of that, this model is the one without the dip-switch.

I also tried pulling all of the RAM, and then trying to booting with each stick one at a time in each socket (4 sticks x 4 sockets = 16 single ram stick combinations) and all yielded the same result.