SB1 severe crash

My SB1 (which is a SB1 AI - Audio integrated) was displaying the lockscreen with issue in the display (line of the middle where "offset".

 

I decided to re-install the os 36.

 

I did it.. and during the install, an exception occured saying install didn't complete.

 

At the end, the SB1 reboot and now is stuck in the Windows CE classic desktop environment ...

 

Yes, I can see the Start menu (with suspend), and so on

 

But, how do I get out and reset this bloody machine ?

 

I've tried Home/scan ==> Nothing happened

 

So, do I have another solution than sending it back to where I bought it ?

 

Thanks for any replies