Ok, this is from my husband, who does this for a living:

 

If your fan isn't working when connected, it sounds like the CPU isn't properly reinforced, and it's causing a contact underneath to be loosened.  And that being on your PC without the fan being properly mounted will burn out your core.  The offer to check it out for you still stands, let me know, and I'll sitemail you my cell #

Sitemail | Freestuff | Craftythings | Youtube|

Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.