Help to fix a broken SB3

Hi,

I have 2 classic SqueexeBox 3. Both broken. I power them and nothing is shown on it's display. I only can see the red light of the tosslink connector.

I think they are broken because I plugged them to a power supply with polarity changed.

I have been browsing this forum to find out if anyone had a similar problem, with no luck. I would like to revive at least one unit, and would be glad if someone would guide me to an apropriate post.

Thank you,