I had an issue recently here my laptop was shutting down, just switch off, no warning, turned out it was overheating. I loaded a program called 'Acronis Drive Monitor' and it was telling me the hard disk temp was just about 62 degrees as it shut down. Max should have been 55 degrees. I took off the base panel and it ran slightly cooler and 2-3 degrees cooler. But that is still above specification.
When had disks get too hot, they are likely to cause a failure. I only had a hard disk failure just over 1 month ago, so the overheting is an issue.
With my back panel off, I can see that the internal cooling fan is working just fine. I use my laptop on the arm of my chair, so there is no gap below the laptop to vent properly. If it is placed on a hard desk, there is a few mm of gap between laptop and desk where vented hot air can be vented properly.
I could also see, the more programmes I ran, the warmer it got on the drive monitor.
So...
I bought a laptop cooler. It cost me £16. I had to buy a larger one because mine is an 18 inch laptop. It is basically a base that the laptop sits on. The base has 3 fans in the base. It uses power from a USB port. The one I got, the fans can be detatched and moved, so I moved the fans to the place where the vents are and the fans now push air into the vents. I was careful not to put a fan near to the vent where the laptop fan blows outwards. That would just cause a problem, 2 fans pushing against each other.
Now.. My laptop hard disk is running at 41 to 43 degrees and now well within 55 degree max tollerance and also, 1 week later, not a single shutdown since.
This is the one I got.... For the larger laptop...
http://www.scan.co.uk/products/coolermaster-notepal-u3-slim-notebook-cooler-black-silver-for-upto-19-laptops-movable-fanIt does not show a picture but a pic is here ( I went for the Slim ) ..
http://www.scan.co.uk/products/coolermaster-notepal-u3-notebook-cooler-blackAlternately, they have a huge choice... here...
http://www.scan.co.uk/shop/computer-hardware/all/laptops-netbooks/stands-coolersI am not in any way related to scan computers, just who i chose to get one of these off..