Video Monitor Interference Lines - Get Rid Of?....

I have a SVHS monitor hooked up to my camcorder which is in turn hooked up
to my firewire port, I use the monitor to edit DV.

I have faint scrolling lines of interference moving corner to corner which
are quite annoying...is it electric? Do I need to get something on the AC
plug? Granted I have lots of wires and computer stuff but all that is
running over to the monitor is a heavy duty monster cable.

Any suggestions on eliminating this? Thanks!

Frank