I had this problem where the stb would boot and stop at "Start" or "On"
and was locked up.

After googling the problem all day I see there are lots of people who had this error but never fixed it.

I was told it needed to be re-flashed with a new bootloader and firmware.

After flashing it what felt like 10000 times it still didnt work

I opened it up had a last look before it went into the dustbin and saw a bulging capacitor on the PSU board.

A 10v 1000u cap had popped(bulging), I found a 10v2200u laying around soldered it and bingo its working fine again.

Now I have to remember how to get all my satellites back :(