Extended Desktop Issue with ATI

[nates6969]

Hey have a service that requires extended desktop to be activated to an external TV or projector. Our problem we are facing is the entended desktop either becomes unchecked or will not stay checked if the video card does not detect a valid input from an external display (cable becomes unplugged or cable is too long). I heard Ati and nvidea cards are designed to disable the output if no tv display is detected. I also heard matrox cards allow you to permanently enable this option. So my question is, is there a driver tweak or anything that can be done to force windows to leave this output always active? Our main card we are using now in our systems is the X1300.

Thanks in advance for your help!