If the Fan's stopped working then more likely it's fried the CPU.. but if you can take it appart..re-apply some heat paste..get a new fan then if might just boot up again..

I've had this happen to my Main PC..
and all I did was buy a new fan some heat paste cleaned it all out and applied the paste onto the cpu..
put the heatsink back in place.. new fan in place stuck it all together started it up was working fine..