4 graphic cards->ok, 5 graphiccards -> not ok

[martin.po21]

Thanks for reply.
About reward.. please do not get me wrong, i am just desperate and out of ideas

lspci | grep VGA output recognises all 5 of them:

PHP Code:

pozi@ubuntu:~$ lspci | grep VGA
07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Hemlock [Radeon HD 5970]
0b:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Hemlock [Radeon HD 5970]
0f:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Hemlock [Radeon HD 5970]
17:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Hemlock [Radeon HD 5970]
1b:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Hemlock [Radeon HD 5970]
pozi@ubuntu:~$ 


dmesg:
http://pastebin.com/ip62JBTa

syslog is empty.

please tell which log files should i also post, i am a bit new to linux sistem (half a year) and do not understand it yet completely.

No, i did not tried it on other OS, so i can not tell.
Would win7 ultimate be ok for test? But unfortunately i will be able to do this next weekend, today i have to go to city where my school is :/

Again, thank you.
Please tell if you need more informations

EDIT: after searching log files i found one mentioning 5900 card quite a few times, and one failure is mentioned:
xorg.o.log:
http://pastebin.com/p7CzMdPq