I was using a set of ear buds, and watching Sprint TV, and the TV locked up. I turned off the phone, and back on, all is good now, except the headphone jack on top is not working. Tried the ear buds on the pc and they work fine, but not on the Hero. Music just comes out of the speakers. Anyone have an idea????
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FrogSplatter
Newbie
read the stickies first 
Headphone Jack does not work at all
Issue:
After booting the phone with the headphones already plugged in, the headphone jack no longer works.
Workaround:
Unplug the headphones, reboot the phone, then plug them back in. Do not leave your headphones plugged in if you turn the phone off.
HTC has acknowledged this issue and said a fix will be included in the next patch.
Headphone Jack does not work at all
Issue:
After booting the phone with the headphones already plugged in, the headphone jack no longer works.
Workaround:
Unplug the headphones, reboot the phone, then plug them back in. Do not leave your headphones plugged in if you turn the phone off.
HTC has acknowledged this issue and said a fix will be included in the next patch.