Weird . . .
All I can come up with is a possible cause for the PSU problem: Net PSU's have an additional connector to connect the mainboard. Some mainboard however have TWO extra connectors; one connecting to the additional PSU connector I mentioned, and one where you can connect a normal poerconnector, like the ones you connect to your HDD's. Never connect them both. My experience is that strange problems will occur. Usualy the manual of the mainboard explains that only one of these connections must be made.
As for the USB problem: Haven't got a clue!
Hopes this helps . . . a bit
