monitor just verticle lines showing

[sandy beach]

i was working on my compurt ( vista..and all of a sudden everything just disappeared and just verticle coloured lines appeared checked everything...couldnt switch computer off had to remove the power plug switched the computer on again just verticle lines..then i used another monitor just showing these vertical lines.......any idea what the problem is ..grateful..thanks

[VHG]

Also added to Computer section.

[david7]

sounds like graphics card has gone