My NAS doesn't start. Sometimes, when I disconnect it from the power network, wait a day and try to start it, I can but I have to push F12 a lot while starting.
Today I could go to BIOS but the keyboard signal had lost (no power at all). The keyboard does work with another computer.
The same had happened when I somehow had managed to start the OS. Logging screen was shown for about 1-2 minutes and then keyboard and video output lost.
I think it's a hardware issue, but don't know what causes it.