Dear Guru's, I just received my new GPU yesterday. It's a secondhand bitcoin mining card. VTX 7950 3gb. I switched it yesterday with my old card (hd 6870), conected 2 6x2 pin connectors from my PSU en started my pc. Nothing... No beep, no screen, only fans, leds and mijn 3 keyboard lights. Starting up with my old card is still possible. Possible fixes I tried: - Cmos reset via battery and jumper - Motherboard firmware update - Card in other pc (This one did startup untill the windows 8 loading screen. there it hanged. I switched the old card back in his pc, and it needed a cmos reset to work again. Also his 2nd SSD needed a format after this :3eyes: ) - Crossfire switch on the card on 1 instead of 2 - 6x2 pins switched on the card connectors. Tryed 1 6x2 connector. Then it did startup, but no card detected. Seems almost like a power problem... My specs: MB: MSI H61M-E33 (B3) Chip: i5 2310 Memory: CVS 8GB1333 Storage: SSD 120GB 500/525 Agility3 SA3 OCZ en een HDD PSU: Cooler Master Real Power M620 620 watt GPU: Sapp1GB D5 X HD6870 OS: Windows 8 I hope you guys can help me!