Trying to upgrade from 1950pro to a Sapphire 4850. So I uninstall the Ati drivers, shut down, install card and connect 6pin power feed, switch on and reboot. Windows starts, but before I get to the log on screen, the screen is blank and the mouse is frozen at the centre of screen. I've tried using different ports for the mouse - no difference. Mouse and keyboard are the Logitech EX110 combo, the DVI cable is the 'D' version (without the extra 4 pins), and the monitor is a DGM 22" running at 1680x1050, though when accessing the OSD it shows that it's running at 1400x1050, which may be where part of the problem lies, but I can't find any way to change that! Is my PSU up to it? Any ideas folks? P.S. System is as my sig and running MCE fully patched.