So just going back to the original question... How do you know there is "current running through it"? Are you saying that you got an electric shock when you touched it?
If so then this must be a fault with the PSU rather than the Miner?
Not having a spring on one of the screws will not be the problem.
Rich
I was thinking the same thing at first, but a fault on the PSU wouldn't cause the voltage to go to the heat sink.It would have to be a fault on the board it self. The psu would be providing the power only unless one of the wires coming from the psu to the 6 pin molex connector was cut and touching the heat sink or the out side of the case.
We still need to know what the OP means by "current running through it" If he means an electric shock when touching the Heatsink then there must be a fault in the PSU because there should only be 12V isolated from mains coming from the PSU and that would not give you a shock. As far as I remember the Heatsink on an S3 is connected to the Gnd of the 12V.
Rich