HTC Incredible reboot fix
Here is the fix I have found and resolved the reboot issue the one time I experienced it.
1) Power off the phone.
2) Press and hold the joystick when powering up the phone to bring up the boot menu.
3) Use the volume toggle to highlight "reboot".
4) Press the power button to select "reboot".
5) Once the phone is finished rebooting it should be fine.