Unplugging amp while it is still on, damage?

Last night I was moving some things around and forgot that I had left my amp on, I unplugged the power cable. At the time I didnt notice what had happened. But I realized when I plugged it back in! Two very loud thumps to my speakers, I looked to my amp and to my horror finally realized that it was on. Everything else was turned off mind you.

Did this damage anything? How can I check?