Thanks for taking the time to reply.

I followed your instructions and did an upgrade to 10.6.2. It seemed to go OK until the machine rebooted. The iHack screen appears, it all looks OK until I get to the where the login screen should be.

A black screen appears with a mouse cursor. The mouse cursor works, I can move it around, but it's still a black screen. If I press the interrupt button on my PC the correct screen momentarily appears (all the Finder windows and icons etc) and then the machine reboots.If I leave the machine overnight then press the space button all the Apple desktop appears. It doesn't appear after only 15 minutes though.

My card is a Asus badged Nividia 9600GT with 512MB RAM. It worked well under 10.6.1.

Any suggestions at all?

Thanks
Rob.