9600XT Video Issues

I recently burnt out my Gainward Ti4200 Golden Sample playing UT2004. I had to return it to Gainward in Germany, so in the meantime purchased a Asus 9600XT (it was reasonably priced, had VIVO and was a moderate performance improvement over my old card). However, I now have 2 Problems that I never had with my old GS :-

1. Mitac TFT will not size the screen correctly - I always have to wait for the desktop to build and then press the 'Auto Adjust' button (sometimes twice) to get the monitor to 'lock on'.

2. My TFT 'flickers' at times - this is especially noticable when the HDD is being accessed, but can happen at any time. I suspect this may be a power issue, but I have a beefy 450W power supply (that came with my Chieftec Dragon in the days that Chieftec were selling them with inbuilt supplies).

I've tried all the usual stuff - latest ASUS drivers, latest Catalyst, original drived form CD but still have these symptoms.

Anyone have any ideas ?