We have a TMobile G1 phone that we purchased as soon as it came out. We have never had any problem with it except for a defective sim card 6 months ago. A few hours ago when playing a game, the screen went blank. The back light was there, the power lights were on the bottom of the phone, but the screen was empty. When attempting to reset it, the phone does nothing. We have taken the battery out, put it back in. We have tried everything. The phone is fully charged. Is there anything you can think of that might cause this? I can't believe it is a complete coincidence, but at the same time we had the problem with the phone, Tmobile was working on our account - changing out the telephone number for the phone. They also discovered a problem with the sim card that they told me we had to fix by replacing the sim card tomorrow. In the middle of all of that, the screen goes blank.