Problem with the motherboard of the phone. Send it for repair. 7 vibrations is a error code " Heating up " Use ur phone in front of ac for testing :'
I'm sorry, but I think you will need to contact T-Mobile for support. Call them from another phone at 1-800-T-Mobile.
If you don't care much about the info on the phone, then do a hard reset to factory defaults.
http://www.hard-reset.com/htc-hd2-leo-hard-reset.html
CAUTION - DOING A HARD RESET, YOU WILL LOSE EVERYTHING ON YOUR PHONE. REMOVE THE MEMORY CARD BEFORE DOING A HARD RESET.
Good Luck,
Mark
SOURCE: HTC HD2 they gave me the wrong download for english
Well with the phone turned
off, press
and hold
the VOLUME UP
and VOLUME DOWN
buttons, then press
the
END/POWER
button shortly
and release it. You will then see a message
on the screen asking if you're sure about resetting it. If so press the VOLUME UP key. It should boot shortly after that.
Goodluck!
SOURCE: HTC HD2 not "booting up" I have an HTC HD2
take it to your service provider they will fix your problem on the spot usually or order you a new one free of charge. -Derek
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