Stuck at Apple logo

I recently bought a 7th gen Classic which was stuck at the Apple logo, so I followed the answer below:

iPod will not sync, is stuck on Apple Logo

Stuck on apple logo and will not go on diskmode

I was able after some tries to place it on disk mode and even run a SMART test, which came out with no reallocs or pending sectors.

When placed on disk mode my windows PC recognized a drive being connected but just that, wasn’t able to show any drive property or information neither was it recognized by iTunes.

To be in the safe side I tested the HDD in other logic board and same thing happens, this eliminates any possibility of a logic board or even connector failure.

Any ideas of what could be done?