**HELP! TROUBLE RUNNING DUAL 22 INCH MONITORS

Hello,

I need some help haha

I Have a 1900gt and im trying to run 2 22inch monitors, when i connect both via DVI (card has 2 DVI ports) and I boot up one screen flickers, then the monitors will both go in and out of power save mode 4 or 5 times then just go black.... i got another 1900gt and tried it, with the same results. When I disable the second monitor it still does the same thing however when i physicly unplug the second monitors DVI connection the one monitor works fine.

I have tried everything i can think of, reimaging my whole PC incase it was software, rolling back the ATI drivers, changing the video card etc etc

the only other thing i was thinking is that it may be a power issue? i curren tly have a 500watt power supply.

Any help would be GREATLY appreciated

Thank you