I had some fun with the device, configured it as Wi-Fi router and it worked fine for a couple of months. Then hot-spot disappeared and only red LED is now on. I don't have a spare HDMI monitor or HDMI-VGA adapter now to check if there is something on display. I've run a
fsck tool on the SD partitions, there was some errors that was fixed and it mounts fine, but ACK still isn't blinking. When I connect some Ethernet cable, there is no connection and no LINK, I don't know if it supposed to connect before some OS is boot up, so I don't know whether this is the problem with the SD slot, LAN, or something else. The board itself looks good, nothing is broken or burned.
What should I do? Can I run some more checks before I should trouble myself to find a monitor?