If it has only just started to happen and and you haven't changed anything, maybe the horizontal hold has failed. You maybe able to adjust as 412mark412 suggests. Otherwise it might be time to invest in a nice new LCD screen.
seen this thread for a while so, I thought I better take a close look. As you are having this problem Try starting in Safe Mode tapping F5 as it starts, this loads a generic Driver for the Graphics card. If the Raster i.e Picture is in the middle. right click on Empty Desktop then Properties\Settings\Advanced check the refresh rate try it up to 85 Hertz reboot and see how it is. As when the Graphics starts acting up it could be the Card. Monitor may have wheels at the bottom or buttons on the front or on screen when you tap the right button on the monitor, or behind a flap on the monitor
the current refresh rate is 60 hertz, i tried 75 hertz but that only made the left side as bad as the right.
my operating system is opera.
resolution is 1280x800. i experimented with this but things got too stretched.
i just discovered the intel graphics control panel. this had horizontal and vertical hold so i had ago at these. i did manage to get rid of the thick black line on the right, however this obviously increased the left side too, resulting with part of the picture on the left not being able to be seen.
i just have to put up with it. at some time i will be using my 22 inch lcd tv as a monitor, thats as soon as i get the big-screen plasma tv that i'm after, maybe the problem will disappear then?
You don't have to put up with it. Your browser is Opera and your operating system on a new PC could be Windows 7. With most monitors there is a control, which allows you to centre your display. What is the make and model of the monitor?