Flashing Green Light

After arriving home from work this evening, I found both computers had shut down due to a storm. Surprisingly, only one started back up. There was no response on the "down" one when we pushed the button to power it up. We unplugged everything from the back of it (monitor, keyboard, speakers, power, all the usb connections) and then plugged just the power source in. Still nothing. There was, however, a cute little flashing green light near the fan. This flashed even when there was no power cord plugged in. I thought this was strange. As it turned out, the computer's power supply box was fried. Luckily, I keep a spare computer around for salvage parts. The down computer is up and running now. We've taken the photos and burned them to cd just because of this warning. Storm season always reminds me to power down computers and other electronic devices.