I wish I had known about a lot of this sooner than buying my Mitsuibshi lol. Also the fact that I paid a lot more for mine by not waiting. Oh well, lesson learned. I am going to go an attempt to adjust the picture a bit with some recommended settings I saw on here. I am also happy to now know what video noise is for.
I had to reply back about what my problem with was with the PC. It would seem there is a humming coming from the electrical box while the htpc and TV are on at the same time...so, the dimming I was seeing was more than likely the PC periodically taking more power. Ouch, that is terrible for electronics. Undervoltage is almost as bad a voltage spikes. *sigh* I just ordered 2 new Belkin surge protectors. Hopefully the one I was using just can't supply enough power, though I am sure I will be trying to find another outlet for the PC.
A few post back someone asked if "xxxx joules is good" or not. Through reading for the last week or so I have learned quite a bit. Joule ratings are a joke. Look for clamping voltage (the most common decent being 330v) voltage pass through if its marked. Most surge suppressors are 400v. It was amazing trying to talk to a clerk at BB who said "you need this $129 monster surge protector." It had no electrical stats on the box, and they didn't know what the heck I was talking about. Down with overpriced/overhyped accessories! Long story short, 330v clamp, and higher amp protection is better. Oh, and as I have probably shortened the lifespan of my PC/TV/surround sound now due to most likely undervoltage your ABSOLUTE best bet for a home theater set up protection wise is a big ol UPS. Protects from surges and protects against undervoltage for when you/your utility company mess up. It would always be nice to give that hot bulb time to cool off with the fan on in the event of a power outage too.