Laptop not starting-keys turn blue then off

Hello,
I have a DV6500 HP Laptop with windows Vista. It had been on for about 45 min when I decided to stream a watch instant netflix video online via a Firefox browser window. I walked away for a min and when I got back my laptop was off. At first I though maybe I had accidentally turned it off so I went to turn it back on and when I hit the power button the keys turned blue for a sec, the screen didnt even try to initialize, and then the whole thing went dark. I tried taking out battery, unplugging cord, and even tried holding the power button down for 60 sec and nothing worked. The only thing that happened as I was holding the power button down for 60 sec was the lights kept going on and off every other second on the keyboard but nothing every started up. PLZ HELP! I just had to replace harddrive 7 months ago and now the laptop is doing this. All it does is sit on my desk and it cant manage to not have a problem.... any ideas?...plz