Flashing yellow light?

I don't know much about this computer.  

Model A280P-00 

P/N AA24120L

DELL P/N P9550

I plugged in my scanner, and then everything went blank. I disconnected everything, and waited 15 min, just plugged in the power cord, nothing but the power cord, and touched nothing, and it was blinking yellow. Did I bend something when I plugged in the scanner? Could that be why it wont power up? Any help would be greatly appreciated.