i have technical problem in my computer

[myprince2003]

Hi, I am trying to run four monitors on my computer I bought Asus SLI enabled motherboard (Asus P5N SLi motherboard Core DUO/QUAD 775 P5NSLI NVidia NForce 570,Dual Channel DDR2 16GB, 1066FSB,8xUSB) also two Galaxy SLI graphic cards (Galaxy 95TFF8HUFEXX GeForce 9500 GT 512MB 128-bit GDDR3 PCI Express 2.0 x16 SLI Supported Video Card ) after downloading the software I tried to play three monitors at the same time but it did not work so I turn the computer off. When I turned the computer on on the next day one of the monitors started the window and then the monitor turns OFF but the computer still ON. I do not know what to do and what happened so please if you can help me with some advices?? also i can run the computer on the safe mode but i want it in the normal win condition.

[myprince2003]

i gust removed one of the graphic card and i had the same problem. i think the problem is not from the graphic cards it is from the computer.