BIG PROBLEM iPod 4G+Rockbox

[truant]

Hi all! I need some help!
I've installed Rockbox in my iPod Photo.    
At the outset everything has gone well, I've copied all my music into the iPod, and then I have securely disconnected it from the PC. Then, Apple logo has appeared, and it does not disappear, even reinitiating (rebooting?) the iPod. And I can't shut down it!! I can do nothing!!
Now my PC don't recognize it and all I can do is nothing!
Please, I need help!

[Llorean]

Hold Menu+Select to reboot the iPod, then immediately turn on, and leave on, the hold switch.