Last night after a movie, switched my PJ off. Whilst the usual cooling down heard a fairly loud sound, bit like when you switch the Iris function on and off. At first I though oh sh*t the lamp's probably blown. Waited for the PJ to fully power down and left it to fully cool for 45mins before attempting a restart to see if all was still well. Restarted PJ, thinking the worst but all was fine, on power down it was all normal as well. Phewwww. Never done this before on me so I was a bit concerned. Has anybody else experienced this or something similar on power down ?