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Make sure Q1 is connected. If you have an open circuit on one of the legs you get a 2.5v on the 5v rail (dont ask me how i know this *grumble*).
It is really easy to bust the through hole as you have to pull that transistor off to even get at the solder side of the board.
Use the schematic linked above and a DMM on continuity mode. Make sure the transistor is connected to the next components. You are relying on a solder joint to melt all the way through the board and connected on the other side. Repeatedly removing the can transistor damages the through holes and you end up with an open circuit.
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