The electric power was shut down in my appartment this afternoon and unfortunately my Bubba didn't appreciate it

When i came back the led was on but i couldn't access it neither ping it.
I tried to reboot it by pressing the button.
It did shutdown.
I rebooted it.
Same situation: led is on but nothing more... no access ... no ping
I formated a usb key (fat16).
I dowloaded the minimal image, checked the md5 and copy the bubba.img on the key.
I shutdowned the bubba, unplugged the power, inserted the key, pressed the button and plugged the power back.
The led is blinking but the ping to 192.168.0.50 (or to 192.168.1.99 - usual address) is not working.
Any idea ?