[Solved] Sansa clip+: freeze and display a USB-plug picture

[coucou]

HI everybody,

I have a Sansa Clip+, which worked perfectly with the original firmware.

I installed Rockbox a week ago, following all the instructions.
My Sans clip+ worked well with rockbox, until this morning:
I plugged it on my PC (USB) and a few hours later, I turn off my PC. Then I unplugged my Sansa Clip+.
And now, there is a USB plug picture displayed on the screen, and I can't do anything: I can't turn it off, and my sansa clip+ is no more recognize by my PC.

What should I do  now ?
Is there a way to solve that problem ?

Thank you for your help.

[saratoga]

Hold the power button for about 15 seconds to reset it.

[coucou]

Thank you so much ! It worked !