Any ideas about what could have happened and how I can troubleshoot?
What could have happened on the board; in other words, what would have blown between the 12v terminals and the "power up light" that I'm going to be able to test?
These were the questions.
There's nothing roundabout about them.
The responses were all to make sure I was getting power to the amplifier, rather than to explain what might have happened during the accident to cause the amplifier to get "f*cked" and how I can test for the broken component.
This:
[...] My speakers won't work[.] Oh yeah I knew they were all blown but I wanted to know what size they were to replace them.
is not analogous to the questions I asked.