Sounds weird, but the TruePower PS does something with Fan control.
Did you plug the fans into the fan only molex connectors?
If so I would plug them into the regulare and see if this continues.
If not then RMA that bad boy. You got 3 years warrenty on it for a reason, might as well make sure that the PS is not bad.
BTW, does anyone know the post number before you go from "member" to "senior member"
I am just curious