<br><br><div class="gmail_quote">On Sat, Feb 14, 2009 at 10:22 AM, Brian Wood <span dir="ltr"><<a href="mailto:beww@beww.org">beww@beww.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div class="Ih2E3d">On Saturday 14 February 2009 11:02:41 MrVining wrote:<br>
> On Feb 14, 2009, at 9:26 AM, Paulin wrote:<br>
> > I'm having an old problem reappear after upgrading the NVidia<br>
> > driver and then downgrading. Can't seem to figure it out.<br>
> ><br>
> > 1. Upgraded to 180.22 NVidia driver.<br>
> > 2. Eventually downgraded back to 180.16 driver.<br>
> > 3. Put the .nvidia-settingrc file back from before the upgrade<br>
> ><br>
> > Now whenever watching a recorded program there is a thin line<br>
> > scrolling down the screen every minute or so.<br>
> ><br>
> > Can anyone tell me what I should be looking at to correct this. I<br>
> > thought it was caused by the Nvidia settings but since they are<br>
> > back to what they were before I updated/downgraded the driver I'm<br>
> > not sure why it's happening.<br>
> ><br>
> > Any help would be appreciated.<br>
> ><br>
> > Thanks,<br>
> > steve<br>
><br>
> Is it possible that it is not driver related? Has there been any<br>
> physical changes made to the system. I hear line slowly scrolling<br>
> down the screen and I still jump right to grounding issue (retired<br>
> cable guy).<br>
<br>
</div>With NTSC at least, a horizontal line scrolling slowly *up* the screen<br>
indicates 60 or 120 Hz. hum. The rate is the difference between the vertical<br>
rate being precisely 60Hz, and what it really is with NTSC color (in other<br>
words, if 3.579545 was in fact 3.600000, then the bar would be stationary).<br>
<br>
A grounding issue would thus create a moving up bar, unless the scan rate of<br>
the video was far enough from 60Hz. to create a downward motion of the bar.<br>
<br>
I tend to agree that the OP does not have a driver issue, more likely some<br>
sort of interference in the machine itself, the monitor, or the cabling, or<br>
some sort of common mode (ie: grounding) problem.<br>
<font color="#888888"><br>
--<br>
beww</font></blockquote><div><br></div><div>By ground problem, likely it means that there is a difference between the computer ground and the TV ground. So, in this case you may not have done anything to the computer but if you plugged the TV in to a different slot or changed your antenna setup it could explain it. </div>
<div><br></div><div>If you have cable, it could even be that the cable guy came by while you were not looking and grounded the feed.</div><div><br></div><div>I had to run power from my projector to my surround setup to get rid of a line like that. Now everything is on the same circuit. I also ground my antenna to that same sub panel. </div>
<div><br></div><div>Allen</div><div> </div></div>