I'm sorry, I know this must be a common issue brought up here, but searching only came up with topics regarding people "stuck on decisions" and "fans stuck on full speed".
Anyway, I have an Antec DF-85 case which I bought about two years ago. Recently however, one of the rear fans refuses to budge when I start the machine up. Only after a few minutes of jimmying it with a pair of tweezers to loosen it does it decide to start spinning.
I heard that dust buildup can cause this, but I have removed it (just from the case, not the cables) and given it a thorough cleaning to remove the clumps of dust from the blades as well as a few blasts of air into the assembly.
It's not really a huge deal because I could just replace it for a measly $20, but I thought I'd first find out if there were any methods to try and repair it.