"Anything I can salvage?". It's impossible to say with any certainty, but the power surge would appear to have hit the computer via the USB connectors. If there is no sign of burning in the computer, then the amount of energy involved probably wasn't very high - although your head is possibly telling you otherwise. I would guess that the damage might only be to the motherboard. You haven't told us much about your computer, but a suitable motherboard might be available for about £40, and so would be a lot cheaper than a new computer and could be worth trying before condemning it to the skip.