In March 2007, I posted here complaining that I was experiencing the same "lock-up" problem with an LC-37D4U . Sharp replaced the circuit board under warranty and the problem was fixed. However, I was sufficiently scared of future problems, and so I purchased a 3-year extended warranty for $305 soon afterwards. Well, guess what, I found out yesterday the audio doesn't work. I don't know how long it's been that way, since I usually run the audio thru my A/V. I tried resetting, no go. I didn't try unplugging/replugging the set, but that's not a satisfactory fix. I guess I might have the "black goop" issue. Either way, I got till May 2010 to get this fixed under warranty. This set cost me over $2,100 now, with the extended warranty. I am not hopeful about its long-term survival prospects after the extended warranty runs out. No way I would pay $305 for another 3 years. Also, no way I would ever buy another Sharp TV.