I love how part of the directions from apples official website says
"Hold down the power button until the power indicator light flashes, then release it. A long tone will be heard, then a gray screen with an Apple logo appears. There is a progress bar under the logo. As the progress bar moves, your firmware is being updated."
Really, because last time I checked my aluminum imac didn't have a power indicator light.
I think it said "until the power indicator light flashes OR a long tone is heard"
the keyword being "OR"