Maybe the "professional installation" guy had the week off after all. :-?
anyway, if you haven't already (and if opening the case doesn't void your warranty, do at your own risk!), you may try to re-seat any expansion cards and cables -- it's not unheard of for things to wiggle a little loose during shipment, and a bad connection somewhere can really screw things up.
anyway, if you haven't already (and if opening the case doesn't void your warranty, do at your own risk!), you may try to re-seat any expansion cards and cables -- it's not unheard of for things to wiggle a little loose during shipment, and a bad connection somewhere can really screw things up.