Hello,

Long time viewer of this forum, first time posting. I have spent weeks working on this miner I have been trying to make work... it is a headache to say the least.

Hardware:
MSI 990FXA-GD80
Sempron 145
8GB ram
SSD
3x 850W Corsair RM PSUs
16x to 1x powered usb 3.0 risers (awesome)
6x R9 290s reference cards

It has been a lot to get to this point, but now no matter what I try nothing works. I am finally able to get 5 cards detected and mining great in xubuntu, but when I add the 6th card the OS wont even boot. It just is a black screen with a blinking white cursor in the top left. Doesnt matter which 5 cards are plugged in, they work.. but no matter which card I add as the 6th it does not work. Using latest AMD driver, 3.7.2 cgminer. Works great with 5 gpus. Won't boot with 6.

Tried disabling USB 3.0, Firewire, Audio in bios, doesn't do anything. Tried 13.10 xubuntu and 12.04 and 13.04. Tried different versions of AMD drivers. Its not a power issue. This is just so frustrating! Don't know what to try. If you can get me with this 6 one working, I will GLADLY give the bounty. I might even kiss you.