Dell dimension 8100 fan replaced and wont work

[Guest]

I have a dimension 8100 and I just replaced the fan, however it won't work. and when putting back the old fan that won't work. Any ideas?

 

[aford10]

Check out the fan assembly guide here.
http://support.dell.com/support/edocs/SYSTEMS/dsleest/rr.htm#chassis_cooling_fan_assembly