I just aquired a Yamaha Tx7. While mucking around with it , I pushed a button and the name of the loaded sound came up with ERR next to it and the unit was frozen. I found no answer to this error message in my documentation nor is there a troubleshoot area. Anyway. Now when I turn the thing on.. the screen says ((Yamaha Tx7)) and seems to freeze at that and there doesnt seem to be any way for me to unfreeze it by button pushing. Any suggestions ? Could this mean a dead memory battery or did I accidentally dump the OS somehow ? Yamaha no longer supports this unit so I decided that maybe some of you here would have an idea what to do next or if there's some way to reset it not in the documentation that you know about. I'm going to pop it open and give the inside a good cleaning with some air thought I doubt that will do any good.