Is a flickering screen a sign of a dying bulb, or something else? Over the last several weeks I've noticed (especially on lighter/white backgrounds) that the entire screen will flicker, getting lighter and dimmer, in random intervals. This is an original bulb with almost 7,000 hours on it, and the set still fires up the first time you turn it on.

Also I was curious to know if anyone has experience with Best Buy and their service plans when it comes to changing bulbs. Is it something you have to wait weeks for, or it is relatively painless? The set was bought 11/2005 and I have a four-year plan.

Thanks.