It sounds like some of your components aren't properly shielded.

First, make sure all wires are away from all fans.

If you did have fans hitting wires, it may have stripped some of the insulation. Wrap the affected areas in electrical tape.

Even if the insulation does not appear damaged, try wrapping some of the loose wires in one layer of electrical tape to provide additional shielding from EM fields. Computers are high-voltage, high current machines that give off some pretty vicious EM fields, and improper shielding can lead to a whole mess of annoyances.

If the problem doesn't go away, though, don't take any risks. I once had a bad capacitor on my video card, and the damn thing literally caught fire, taking out my processor and motherboard with it. I was lucky to be able to retrieve my sound card and hard drive.