Black screen when monitor connected to one graphics card port only

A couple of days ago did a back up using SuperDuper. The program is set to send the mac to sleep and when I tried to wake it got a black screen though the system seemed to have woken judging by the sounds. I've had issues after back up with the system freezing so tried rebooting as the first option, unplugging and reconnecting everything but still a black screen. Tried a second monitor and this worked but on reboot it too turned black. I then tried the second graphics card port and this time the screen worked and rebooted fine too. Since then I've tried the original connector/port and sometimes it works sometimes not and mostly even when it does work when I connect at first a reboot results in a black screen. The obvious logic is that this port has gone (ATI Radeon HD 2600) Apple say I have to return the whole kit to base for them to evaluate. I can't afford to be without the Mac for a week or however long it will take so I will just buy a new video card and install myself but just wanted any thoughts on the issue first - could it be anything other than the graphics card? Other hardware/software issues? Can't think why but don't want to shell out if that's not the problem.
Also, will the NVIDIA GeForce GT 120 work with my 2008 Mac Pro?
Many thanks

The 2600 does seem pretty rubbish - never had a Graphics card go on me before - and especially not in less than a year. Of course Apple said I had to return the whole machine to base rather than ship out a new card. It was less disruptive to shell out for a new card than lose the machine for a week or two under warranty. The GT 120 seems fine to me but if you need extra graphics support for 3D, gaming etc then I guess the 4870 is the more powerful option.
Just to confirm it is the graphics card have you tried reseating it in another slot?. Also I found that for a while at least swapping to the second monitor port worked until that bit the dust after a week.

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