I accidentally connected an APU1.c with wrong polarity: switching power supply with 12 V DC, but plus/minus wrong.

Now I corrected this and the board simply starts making a clicking sound (relais?) and blinking .. LEDs D10 and D11 and the 3 "status" LEDs D5-D7.

serial console just shows the BIOS line again and again ...

"PC Engines APU BIOS build date: Apr  5 2014"

Same with or without SD card inside.

 

Did I kill it? Any trick to reset or something?

EDIT: seems the PSU is to weak, right? 12V 600mA ... according to the label.