Hi Chris
I doubt that it is a power issue because the SNES controller needs only a tiny amount of power to run and the parallel port would handle it. I would be checking the following to fix your problem:
1. Check the drivers. Make sure other people who have used them have had success.
2. Check the orientation of the diodes in your schematic and make sure your adapter matches.
3. Check the adapter to make sure it is wired according to the schematic.
4. Check your parallel port to make sure it is working properly.
If you have no luck finding the problem, post links to the schematics and drivers you used and we can go from there.
Dug


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