|It depends... What I mean by that, is that it could either be a Graphics card issue or it could just be your monitor. |
Have you installed any new graphics driver updates? If so then maybe this could be why you are getting a weird line down your screen.
Check that your graphics card is securely inserted into the PCI/AGP slot.
You should also try using another monitor just to find out whether the problem is with the graphics card or the monitor.
If you are still having the same problem after using another monitor, then try to borrow someone elses graphics card or buy a cheap one. Also if you have the ability to then use your Onboard graphics card if you have one on the motherboard.