Grainy picture

[shenmueguru]

I've noticed some worsening of the picture of my HDTV - it's usually grainy on non-hd channels, like most HDTVs, but it seems to have gotten worse. Only thing I've done is removed the coaxial that delivers the cable to put in the VCR coaxial, and put it back after using the VCR. Don't see how that could have made the picture worse. I'm using a signal strengthener as well, that's doing squat. This tv is getting a 4.6/5 on circuit city, can't see how with the grainy, undefined picture I'm getting now. Any ideas on how it could possibly have gotten worse, or ways to fix it?

[Incinerate_IV]

This isn't really related, but I once had to replace a bad DSL cable to get my DSL working again, so you should also try to replace the video cable on your TV also.

[shenmueguru]

I only got the TV about 2 months ago, could the cable still be a bit faulty?