I just recently bought a power supply to go with a 7870 I also purchased. I put it in and went to boot it up, everything turned on fine(fans leds HDD etc) but there is no video or power to the usbs. I tried everything on the checklist I also tried running it without the case, with just the necessary components using onboard graphics, with the old psu, with different ram that is know to work and it still doesn't work. I'm afraid its the motherboard but I don't want to spend money on it if its not.
Specs:
Phenom ii x6
Radeon 7870
Ocz 700 watt PSU
Asrock n68-vs3 ucc mono
Adata ddr3 ram
Specs:
Phenom ii x6
Radeon 7870
Ocz 700 watt PSU
Asrock n68-vs3 ucc mono
Adata ddr3 ram