This picture shows the other side of that air vent you have on your laptop. This one is from a Sony Vaio. If your laptop is getting very hot and the fan seems to be constantly on then you may have the same problem – the hot air can’t escape. It doesn’t cost a lot to fix, much cheaper than replacing your machine. As your laptop overheats other internal parts also overheat and can cause motherboard and hard drive failure as well as weakening internal cable catches etc.