Today I picked up a 30" Cinema HD Display and a last revision G5 Quad Core 2.5 (for the low price of free!) and I'm trying to troubleshoot the display. The seller (well, giver) said one day the display just wouldn't power on anymore. Before dropping a bunch of $$ on a new power adapter, which we think is the culprit, is there anything I should try to do to see if i can get it on again? Thanks!