Windows 7: Fan stops spinning after boot

Hi guys,

Someone brought me their laptop yesterday, not usually my kinda thing to do repairs but I thought it was gonna be a software issue but no
Anyway, the problem was constant BSoDs on Vista so I figured I'd install 7 which worked fine for a bit but it was still playing up given it was a fresh install and then some more blue screens! I ran Windows Memory Diagnostic and it said there were errors within seconds but I couldn't get back onto 7 to view them. This morning I cleaned it out and swapped the memory to the other port but the screen wouldn't even switch on then, so I put it back and made sure it was seated properly and ran memory diagnostic again and no errors! Success! The only thing is, the fan isn't spinning it spins for about 5 seconds but then nothing and I imagine soon enough it'll overheat.
If anyone has any suggestions I'd be very grateful!

Thanks

Check temps -

- Download SpeedFan - Access temperature sensor in your computer
- Download Speccy 1.14.288

The fan on my HP dv7 laptop is on for a few seconds after boot-up, then reduces/ turns off (??). When temps get high, it turns on; variable speed as needed.