i have a hp dv9821. The laptop was running well until one day it just cut out, i then tried to turn it on again, and the blue lights came on for about 2 sec(power, volume, mute, etc) and then cut out. I left it for 20 mins and it came on fully and i was on the internet for 5 mins then it cut out again, and will not start or even flash the blue lights. Any help on what may be broken?