Official Desire Z stuck at splash screen

[Guest gianka84]

Hello guys,

i was playing with my DesireZ last night and suddently it freezed.

I've pull out the battery, then reboot but it stucks at the HTC splash screen (white and green HTC logo).

I'm still able to access bootloader and fastboot, but when I try to perform a factory erase it freezes again and i must pull out the battery.

What could I do? I've original bootloader, ROM...all out of the box!

Thanks, I wanna have my chance first to call the assistance..