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welp, bad news. I installed the new power supply in the Optiplex 740 and... nothing. Still doesnt boot at all. So at this point I assume the motherboard is dead? I don't see a power indicator LED on the board, but if it has one it certainly isn't lighting up. The computer doesn't do anything...

I have this machine. I'm a kids dentist and it is in our office. We had to wire in headphones and disable the flashing lights so it wouldn't be so obtrusive, but it is awesome and the kids love it. Just last week it stopped booting up. I think the power supply in the optiplex 740 died. I ordered...