Can't mirror displays on Hackintosh / GeForce 7300

Here's my hardware setup: http://secure.newegg.com/NewVersion/...Number=5659825 (or see signature below)

I'm running 10.5.2 on a Kalyway install (started at 10.5.1)

I have 2 monitors connected: 1 regular 19" LCD by Hanns G VGA connection, and a 47" Philips LCD television connected to the DVI port.

I can run 2 separate displays with no problems. But for some reason, I cannot mirror the displays. The second display goes all black an only the cursor is visible.

Anyone else having this problem, or have a fix for it?

Thanks for taking the time to help out.

LJS