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Hi, Welcome to Fixya. Vertical line on the screen was caused by a bad video card or cable. If the video card is embedded or built in on the motherboard of the computer. It means that the motherboard needs to be replaced and would be better for a technician to check it so that we can avoid more problems. If you can check the warranty of the computer so that you can send it for repair free of charge. Thanks
This can be caused by a newly added device or your Video card driver especially if you have done a recent update: try booting your (windows based) computer in 'SAFE MODE' (e.g. Hit F8 while the computer is booting up) and fix Video configuration to something safe first (e.g. VGA 800 X 600.
My first check would be video drivers if this is a newly built computer. If it is a computer that has been running a while and the problem suddenly appeared I would reseat the RAM and attempt to boot into safe mode, suspecting a virus infection.
Most likely an issue with the Video Card or Video driver. * Boot to safe mode by tapping F8 while starting up the computer. Selected safe mode with the keyboard and hit enter. Login to your user account. You should see the words “Safe Mode” on all four corners, * Open device manager – Right click “My Computer” – Select “Manage” – Selected device manager from the left. Under display driver, you should see your vide card listed. Right click on it and select “Disable”. Now restart your computer and if this resolves the issue, then the vide card may be at fault. You could also try updating the video driver. Do let me know if you get this far.