Horizontal Streaking on Monitor

[Chris]

My Video card is an old origional Geforce 256 SDR.   I am experiencing 
horizontal streaking in graphics and text mode.  But after fouling 
around in X11 it's very noticable.  I thought it might be the scan rate 
but text mode doesn't have a high scan rate by default.  The monitor is 
fine.  And why I am using a KVM I get the same results connecting the 
monitor directly to the video card.  I'm thinking it's the video card in 
conjunction with the mothboard because I never had any trouble with that 
card before.  Any ideas?

Chris