Hi, recently i have installed a Zotac Geforce GTS 450 into my HP hpe-490uk. After installing all of the necessary drivers i restarted the computer as prompted to and can now no longer access my desktop. After the 'starting windows' screen after the first bootup screen nothing happens and my monitor just loses connection with the PC. I also managed to wipe the computer and put the PC back onto its factory defaults with no help but being unable to access the PC as soon as I restarted again. I think it would also help if I mentioned that the screen only shows up in the middle of the screen on a small box. Thanks Shabazz