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280X no display issue

Level 7
Hi all, after a bit of advice.

Got 2 x 280x in crossfire and the other day decided to give the main card a break and switch the cards in the rig around. however when I rebooted there was no signal. swapped them back and everything was fine... so tested them 1 by 1 and found card 2 refused to output from DVI-D or HDMI outputs.

Tried in another rig and same issue of no output. I've RMA'd them to the retailer but they've tested and advised all ports work. received the card back and same issue exists..

Anyone got any ideas on a fix ? banging my head against a brick wall atm

Level 10
Any possibility you could test one or both in a different system? - One possible way to verify retailers test.
Lian-Li PC-A77F Full Tower case
PC Power & Cooling Turbo-Cool 1200 ATX12V & EPS12V PSU
ASUS Rampage IV Extreme LGA 2011 X79
Intel Core i7-3960X 3.31 LGA 2011 CPU
Intel RTS2011LC Liquid Cooling Solution
Kingston KHX24C11T3K4/32X (quad 32Gb memory kit) 2 each
ASUS Radeon HD7970 DirectCUII 3Gb GDDR5 PCIe 3.0 x16 Video Card (two in CrossfireX Mode)
Western Digital Cavier Black 2Tb SATA III 6.0GB/S
OCZ Technologies Vertex 4 SATAIII 6Gb/s 512Gb SSD