From: push@media.mit.edu (Pushpinder Singh)
Subject: re: Centris 610 Video Problem - I'm having it also!
Organization: M.I.T. Media Laboratory
Distribution: comp
Lines: 27

> When the computer is set for 256 colors and certain operations are done,
> particularly vertical scrolling through a window, horizontal white lines
> appear on the monitor (which generally but not always spare open
> windows).  These lines accummulate as the operation is continued.  If a
> window is moved over the involved area of the screen and then moved away
> the line disappear from that area of the screen.  This problem is not
> observed if the monitor is configured for 16 colors or a 14 inch Apple
> monitor with 256 colors is used. 
> 
> I suspect a bad video RAM chip but cannot be certain.  The problem has
> been apparent since day 1 but has gotten worse.

I'm having exactly the same problem.  Again, it's fine when I switch to 16
colors or a smaller monitor.  My configuration is:

Model: Centris 610 with 4 MB/80 HD, 512 VRAM, no cards
Monitor: MAG MX15F with 16" monitor adaptor (for resolution of 832*624)

I just discovered the problem a little while ago after plugging in my
new MAG monitor.  It seems to appear either when scrolling through a
window or when using Alpha or Word and I enter <return>.

My guess is bad VRAMs as well.  I really hope it isn't a design flaw.  Is
anyone at Apple listening?

Pushpinder Singh
push@media.mit.edu