Video problems

When my computer boots up the screen is unreadable. All the text and graphics on the screen are just shifting side to side. I have to reboot several times until this problem goes away. This happens from the very beginning of boot up so I'm guess it must be the video card. I'd really appreciate any suggestions.

Thanks, Phil

 

Sounds like the picture in not locking, but rolling side to side.

It could easily be the monitor as well, with a failure in the vertical or horizontal synch.

Have you tried another monitor, and checked all the cables are correctly plugged firmly in?