recently i installed an app called,"fingerprint screensaver" on my droid 2 global. as soon as i set it as my home screen, it went dark. i can't get my phone to work at all. on the lock screen it seems to work fine but as soon as i unlock it it's black again. i can slide down the tasks bar but nothing else. i tried taking out the battery, putting in a whole new micro sd card, and tried to reset it but nothing will work. any suggestions?