I purchased a new pre-configured computer system this Feburary. The system worked fine until around several days ago. I was using IE to nevigate web pages and the screen width suddenly got shrunken to only 1/3 the screen width and centered on the screen. I rebooted and it gave me a normal screen size on boot and on command-line mode, but the screen size is shrunken when I'm booted on to Windows. What is happening to my computer? Could anyone help on this? Thanks in advance. The processor is Intel Celeron. The Monitor is KDS XF-7T. The OS is Windows XP Pro.

Try changing the refresh rate; display properties > advanced > monitor > monitor settings > screen refresh rate Also tick the box "hide modes that this monitor cannot display"

Changing the resolution or refresh rate doesn't help. I re-installed the Monitor driver but it didn't solve the problem. I re-installed the Display Adapter driver but it didn't solve the problem. I plugged the CPU onto another monitor and it worked totally OK. So is it the problem with my monitor?

Have you got another system to plug it into? That's maybe the easiest way to find out.

Now my monitor cannot get turned on and I plugged it into another CPU and it didn't work. I suspect I need to call the monitor vendor. Thanks!