Htc Desire Z with CM 7.2 restarts directly after pin
yesterday I downgraded the Stock Rom from 2.3.3 to 2.2 on my Desire Z and unlocked the bootloader, all fine, I installed ClockworkModRecovery and flashed Cyanogenmod 7.2. Everything fine, the phone booted, made a backup with ClockworkMod, set some settings in Cyanogenmod and installed apps.
Today I startet Cyanogenmod again, no problem, then I updated ClockworkMod Recovery to the latest version, since the tutorial used an older version. After rebooting to Bootloader I had to pull out the battery and insert it again, since nothing happened.
I hoped nothing happened to the phone, booted the phone, entered the Pin, then it was time to unlock the Sim-Card. Now the problem, then the screen turned black and the HTC Bootlogo appeared. So I tried again, same problem.
Then I first wiped all data and flashed Cyanogenmod again with ClockworkMod Recovery, same problem again.
Do you have any ideas, what can I do now? Thank you for your help.
Sorry, english is not my mothertongue, it is german.