Actually, we have been having short power outages outside Houston. Sometimes I have to reboot to reconnect to the Internet and sometimes not. Twice, I had to remove the battery and unplug the computer to get it to reboot. Pain in the you know what!
My HP - just a year old - never shut down completely . As I said , the on/off switch was still green , and the fans were running super fast for some reason . Hence , my reboot .