My guess would be that the parallel isn't set up properly in the BIOS. It's an easy thing to overlook when changing the seventh random person's motherboard for the week, and sometimes the default in the BIOS is set to disable it.
No drivers for the sound card is just sloppy though, I wouldn't take my computer back to that shop. The drivers would have come on the friggin CD for the new motherboard. Assuming that it really was a NEW motherboard.
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Anamnesis
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