Open case and reseat the "power harness" several times. Follow the power sw. wiring/harness to locate it. If that doesn't fix it, replace power button if you can find one for that case. Otherwise, visit Radio Smack, locate a "momentary button sw." or N/O type(normally open), you may need to drill hole to attach or long wiring to route it, use common sense here.
The real test to see if its a sw. problem, locate where it plugs in at. Those pins can be "shorted" for a moment and it should power On/Off the system, use care and small screwdriver or metal contact.
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