I've encountered the weirdest problem in my time with PC's guys, maybe GAF can shed some light on this issue.
For reference I have a:
Asus P8P67 Mobo
8GB Corsair Vengeance RAM
i5 2500k @4.2GHz
Sapphire HD7970 @Stock
Last Friday night I was playing BF4 online and everything was fine, shut down the computer, next day I turn it on and have no video output, checked the cables and restarted the PC... still no video, I tried with 2 different monitors one with DVI the other with HDMI and still nothing. Thought the graphics card went dead on me, tried it in a different computer and it worked flawlessly, thought maybe CPU/Mobo so I brought an older card (Radeon HD3850) and I get vide output, everything works fine so I'm guessing RAM/CPU/Mobo/HDD is ok... must be PSU, probably went defective and is not powering up the 7970 properly. I borrowed a very decent 600w Corsair PSU and still no video output, tried with the HD3850 and get video and the PC to boot up normally.
Going insane at this point, everything is ok, so as a last resort I tried on the other PCI-E port on the mobo with the 7970 and get video... the fuck? The PCI-E works with the 3850 but not the 7970??? Any of you had this problem before or know what could be happening here?
Right now connectedt the 7970 to the other slot and set the slot to high performance (4x) in the bios, anyone knows if performance will be affected since it's not running at 16x? Do I need to get a new mobo or can I run with this setup until it makes more sense to upgrade both CPU and Mobo, right now the 2500k is doing just fine.