Problem with dual screen with a Toshiba TV

Hi everyone,
Been struggling a lot over the last 24 hours so thought I'd ask you all for your expert advice!

Desired Situation:
Computer running with 2 screens. A 22inch Samsung and a 40 inch Toshiba Regza.

Currently, when I connect both screens to my gfx card (ATI 1950PRO) both screens go blank. They are connected by DVI cable (Toshiba input is HDMI)

I managed to get it all working initally after some trial and error but now everytime I connect the Toshiba both screens go blank. I've tried running each screen individually and no matter what I do the Tosh doesnt display anything.

I've unistalled my gfx driver and re-installed it but to no avail...

Im currently running Windows 7. I figure this might be the problem as the drivers may not 100% support it. but not really sure.

Any solutions that dont involve installing Vista or buying a new gfx card?

I dont understand why running just the Toshiba doesnt work even from startup... I think it might be the output is 60Hz while the screen cannot display this. Not sure tho. Cant access the settings where this would be controlled however as to access them I need to plugin the Toshiba (which causes the Samsung to go infuriatingly blank!!! untill its unplugged again)

Any help would be appreciated..

Regards