I just replaced the mobo on my zire 71 with a known good board. At least i thought it was. It was the first time i have taken one apart so i am not sure if its just the apps i got or something inside. I installed bejeweled tonight and whenever i switch to it the screen got white but i can hear it running. I turn it off and back on and now i can see it. Same for when i go back to the main screen. None of the other apps do that just that one so far. Thats the only thing i have added. I really just want to be sure i put it back together right