I have a client coming in on Monday who is stating that when he plugs in his LG 34UM95 display or his projector, neither receives any signal from the AMD Radeon HD 7950 graphics card. We have tested this card over DVI and it works flawlessly but have not yet tested the HDMI port. After searching the web with every term I could think of for this issue, I could not find one person who has said the card worked perfectly but not over HDMI. The system is a 12-core dual 2.93 with 32GB of 1333mhz RAM and a Samsung EVO 840 SSD drive. I just put a fresh install of Yosemite on it Wednesday and when he took it home and tried to hook it up to his monitor, it showed "no signal, power saving". I had him hook up his laptop (MBP) via HDMI and the monitor came alive and worked perfectly. So, it's not his monitor or his HDMI cable. It's definitely something up with this card. Any thoughts on things I should be checking (other than the obvious reset the PRAM and make sure both power cables are properly plugged in for the graphics card)? Thanks!