Need help fixing phone.

[tsunme]

Sorry for posting this in this sub-forum, but this site doesn't have a sub-forum for my phone, hopefully someone can help me though. I have a HTC HD2 and it had froze 1 day, so i just took out the battery and restarted it, and now it won't boot past the HTC screen and it will constantly loop there. I didn't jail break it, it was all stock, i want to know how to fix it.