I would say that you should try a hard reset.
HTC HD2 hard reset
If
a normal reset does not solve a system problem, you can perform a
factory reset. After a factory reset, the phone is restored to its
default settings-the way it was when you first purchased it and turned
it on. You will lose any programs you installed, data you entered, and
settings you customized on your phone, and only Windows Mobile software
and other pre-installed programs will remain.
There are two ways to do
a factory reset. One
way is perform a
clear
storage process through the phone settings.
The other way is to
perform a
hard reset by
pressing certain buttons on your phone, in cases when you
are unable to start up your phone and enter the phone settings.
Warning!
Your phone will be set back to factory default settings. Make sure that
any additional installed programs and important data on your phone have
been backed up before you perform a factory reset.
Important
If Encrypt files when placed on a storage card is enabled, back up all
files from the storage card before performing a factory reset (Clear
Storage or hard reset) or updating the operating system. Otherwise, you
will no longer be able to access the encrypted files on the storage
card. Use ActiveSync or Windows Mobile Device Center to transfer files
between your storage card and computer. After the procedure, copy your
files back to the storage card.
To perform a HTC HD2 Leo hard reset with buttons
1. 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
this
message
on the screen.
2.
Release
the
VOLUME UP
and
VOLUME DOWN
buttons.
3.
Press
the
VOLUME UP
button
to
perform the
hard reset,
or press any other button to cancel the reset.
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