[mythtv-users] Interference lines in all recordings

[Tim Gray]

I know this is not mythtv specific.  But someone out there has had to 
deal with this and I cant find anything out there that talks about it.

I have a mythtv box with 2 PVR-350 cards  It records great except all 
recordings have a diagonal set of interference lines recorded in them.  
each channel has the lines at different angles some have them very 
faint.  How can I get rid of these?  I am sure it has to be a problem 
with the PC generating it as nothing else in the house shows those lines 
when watching the same channels live.

copy the file to a laptop, see the lines, so they are getting recorded.

Is there a way to get rid of the interference from the PC getting into 
the tuners?