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I tried all of the above and no luck but THEN we realized we had it plugged in to the surge protector not the battery backup. Once we plugged it in to the battery backup it powered up like a champ! Good luck!
There are a few things in this model to cause this. Most common is the vertical circuit, or the regulator circuit for the power supply. both of these will run you $300-$500 if you call a repairman. If you know how to use a meter and solder I might be able to assist you in the repair yourself. The vertical circuit is VERY easy to repair if you know how to solder. Let me know so i can help!