Today is a sad day.
One of the first apu2b4 boards, even with the manual soldered HW fix (soldered by pcengines), died ;(
It started to act up and first I blamed my OS (OpenBSD best thing since sliced bread).
I tried to login but I was not able to and after power off/on LED stayed dark.
As I unplugged the cables I heard a strange sound and after opening the case I saw this:
The RTC/CMOS battery exploded :(
Fortunately I still own a APU1 to replace my private internet router until the APU4C4 arrives ;)