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There are several possibilities, but a factory data reset would remedy the issue no matter which reason is causing it, with the exception of a hardware problem such as dirty contacts beneath the power switch.
Here is how to do a reset on the HTC Incredible (first backup all needed files such as music, pics etc):
From the home screen, select the applications tab (located in the lower-left).
Select Settings.
Select SD & phone storage.
From the Personal data section, select Factory data reset.
Select the appropriate option:
Reset phone (Resets the phone)
Reset phone & Internal storage (Resets the phone and the internal storage)
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