Unhappy [Q] unbricking Lenovo a750 - a750_s148_120428_cybermaus_v1

After bricking with my Lenovo a750 (black screen) I flashed a750_s148_120428_cybermaus_v1 rom.
Now I just have the logo (with the butterfly) over and over again, but the phone does not turn on.

What can I do?