If you’ve loaded some type of software or changed a setting that has rendered your Sprint EVO 4G useless, booting the device in Safe Mode may be something to try. Safe Mode allows you to start the EVO 4G with default software, so that if you’ve jacked it up somehow, you can get in and undo what you did.
1. Shut down the device. If the power button doesn’t work, pull the battery out of the unit, then replace it.
2. Turn on the device.
3. Press and hold the Menu button and keep holding it until you see the Home screen load.
The words Safe Mode should appear in the lower-left corner of the screen to let you know you did the steps correctly. Now you can do what you need to do, and attempt to restart the device normally.