I finished building my computer yesterday, hit the power button and everything lights up. Of course, there is 1 problem and that is the Red LED on the NVidia 280GTX is on, according to the manual it means there is a power issue. This is my first system I have built, so it might be something really simple that I am not seeing.
The parts I selected were (going off memory):
ASUS P5Q Motherboard
ANTEC TruePower Trio 650W
EVGA 1GB NVidia 280 GTX+
4 GB Ram
Antec 900 Case
Intel Core 2 Duo 3.16 GHz 8500
The power supply has a 6 PCIe connector and a (6+2) PCIe connector, which is what I was using to connect both lines to the GPU, red light was on. I ordered a 6 - 8 pin adapter from newegg to be sure that the power supply's (6+2) is just not faulty (waiting on that to arrive in the mail), I am getting ready to trade the PSU in for another stronger one (if the adapter doesn't work), but 650 W should be enough juice. I have read feedbacks that people were able to run this card with this PSU.
Did you remember to plug in the 4/8-pin CPU power connector near the CPU socket? You didn't list the exact motherboard you have (there are a lot of "P5Q" models), but it will either be a 4-pin plug or an 8-pin plug with a cover over 4 pins.
Edit: Your post came in 34 seconds before mine. I didn't see it when I posted.
the gtx 280 requires 38amps on the 12 volt rails. If you want to be safe go with 40 but this isn't a requirment. That current psu has 3, 12v rails, each with an amperage of 19amps. It also has a ground 12v rail so make sure your not plugging into this one. Should be able to use the two 12v rails to get you to your 38amps.