09/22/2016 - Found this page. Removed PRAM battery and it started up. Found another tip that said to reinstall the PRAM battery, remove the laptop battery, and plug in the AC power to recharge the PRAM battery. Left it plugged in for about 8 hours. It worked, which is good because there are no PRAM replacement batteries that I could find on the internet. Thanks for the great posting above, and I am so glad it was one of the easy ones!