So... I know the title is dumb, but I'll explain.
Me and a friend of mine are building a 5GPU rig with 5 xfx 580 4gb, 1200w Chieftec Power supply, and motherboard
http://prntscr.com/hthn8mThe problem occurs when I boot the system with 5gups. The GPUs start working, but windows ( win 10) never boots. I partially solved the issue, by removing 1 GPU, booting it with 4, and works perfectly, and then added the fifth, and again works well. But I tested it , and again, if I have to boot it with 5 gpus, it doesn't work. So its kinda impractical for me to remove than plug in the fifth one every time electricity goes down or the rig goes off...
Any suggestions? ( I haven't done anything to fix the issue as I don't know what to do )
P.S: I have the same setup on 5 rigs, all 5 have the same issue.
first off id prolly replace that cheieftec psu, secondly you didn't say what motherboard you have, just the lack of spec's in general no one will be able to give you a good answer