I found this thread by searching for hang/freeze TR-40 after finding nothing of use on their support page.
My TR-40 not only hangs (green power light stays on and does not respond to input from remote, no picture) but it won't consistently get out of that state even if you pull the power and wait 5 minutes. Currently I have power-cycled it about a dozen times (even though there should be no logical reason why power-cycling once is better or worse than power cycling a dozen times! It's just the only thing I can *do*.)
Usually this happens if it's left powered on for too long, but today it seems to have happened spontaneously when I turned it on, and I haven't gotten it to stop (the green light comes on immediately when powering it on, and then it doesn't respond to input). I'm leaving it unplugged from its power supply, but it drives me crazy that I have no idea if or when it will stop hanging immediately when plugged in and display a signal again. Any thoughts?