What does the blinking light mean on my computer?

Episode 1352 (1:08:15)

Donald from Winnipeg, MB CAN
Acer Aspire One

Donald has an Acer Aspire PC running Windows Vista and he's getting a steady blinking light. Leo says that the blinking can mean something. It's like the "Power On Self Test." The motherboard battery may have died, and the light is telling him to replace it. That's the cheapest and easiest fix. If that doesn't fix it, he should look at his desktop power cord. Then he can move on to the power supply.

Photo by m lobo (Acer Aspire One D250) [CC BY-SA 2.0], via Wikimedia Commons