Access your laptop's BIOS. To do so, press the relevant key when starting up. (Try Del or F2. The key you need varies, depending upon the motherboard, but it's nearly always one of those two).
When you get into your BIOS, all navigation is done using your keyboard (and not your mouse). You'll need to use the 'Up' and 'Down' keys (and possibly the 'Left' and 'Right' ones too), together with 'Enter' and 'Esc'. Don't worry, it's easy. (Instructions will be on your screen).
Somewhere among the options offered you should find something like 'System status', 'System health', 'Sensor', or similar. When you get there you'll see a screen roughly like this:
http://s2.hubimg.com/u/1431589_f520.jpg
Alternatively, use some free software, such as this:
http://www.vee-software.com/free_veesee/
Chris