I was talking to the hubby while reading something on my Compaq laptop, and stopped for a minute or two and when I looked back it was going into hibernation. Now I can't get it to come back on. This is happened before once or twice and I can't remember how I got out of it. I tried unplugging and removing the battery, no luck. There is no light or fan noise at all and it's completely dead now. What am I supposed to do, and what is the purpose of this function anyway?