Running two monitors

I thought I'd retitle this one before i pay my local shop £57 per hour (no joking). Basically, I have installed a specialist graphics card (a Radius ThunderPower 30/1600) in my Mac. I need to run a CRT monitor off of this to do some psychophysics experiments for my PhD. The other monitor runs off the existing graphics card. I need to run it in extended desktop mode. Initially it worked for about 10 minutes untill I foolishly switched to the other monitor mode (where you see two copies) and tried to run an application through the special graphics card (althought you would think this would work). Both cards still work seperately. I have tried lots of things but cannot get them both running. HHHEEELLLLPPPP!!!!!!

Hi, Hairlosscream -
Also, in the Monitors control panel make sure that one of the monitors is set as the main one (it's the one with the miniature representation of the menu bar - you can drag that from one to the other), and that the icons representing the monitors are touching, ideally matching their physical relationship/orientation. As I recall, the monitor icon marked with a "1" is fixed, and the other is draggable.

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