Tech Support Suggestions? ASAP, please.

[agentelrond]

Our desktop PC (HP Pavilion) just suddenly ceased to start up. We followed all the suggestions found here ( http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph06788&lc=en&dlc=en&cc=us&product=3623529&rule=13629&lang=en#bph06788_section_1 ) under "Power supply light on or flashes," up to #9, where we just said, 'fuck it, we'll pay someone to work on it.'
So, at least as far as the big stores go, which has the best tech support people? Best Buy? CompUSA? Microcenter? Any other suggestions for someone in the NoVa area?

Thanks so much!