LattePanda does not work

the first time I started the lattepanda did not start.
I thought I had a poor adapter 2.0 A
I bought a stronger 2.4 A power adapter
started windows, posted error message windows can not start
and reset the latte panda
I tried to push the boot and reinstall the panda
no response, no buttons worked, F1 - F8, DEL
I tried the boot usb key and nothing
I do not know what to do next
please help