Why does my laptop not turn on... right away?

Hello,
I have a hp pavilion dv2000 laptop. Everything works great but when in use I've noticed that the bottom gets really hot, (just putting it for extra info). Also I can turn it off but when I go to turn it on it won't. I push down on the button but nothing occurs. I have to try a couple of times and hold it down for about 30 secs for it to start. Other times I have to leave it alone for hours with the charger in. I know that the battery isn't running low because the charger is in 24/7 and the blue light notifying the charge in on as well.