|Similar issue. However, in my case the video card has not been fried afterall, which might also apply to yours.|
I've two dell precision 490 workstations. Had a HP Quadro FX3700 video card working fine for a couple of weeks in one of them until a few days back problems started. I got exactly the same system response: green lights 1 2 3 followed by two short beeps, no video output at all, and no booting. Changing the video card to a Quadro NVS440 that I had lying around gave me back a fully functioning system. Hence, the PCIe x16 slot is still functioning. Placing the FX3700 in my other 490 gave exactly and immediately the same issue, which seems to indicate its the video card that passed away. The FX3700 has a TDP of about 80W, which is well within the 150W limit. The 6-pins PCIe cable for supplying additional +75W power has always been connected. Please note that I did not do anything with bios or software raid updates whatsoever. This behavior started in my perception just out of the blue.
The surprising fact is that this Quadro FX3700 works flawlessly when I place it in a dell precision 380. I'm puzzled!!!
Does anybody have a clue???