From what you state I'm not sure your issue is a logic board problem here.
But to answer your question on baking your board people do strange things and because it appeared to work assumed they fix it. Sadly, a cold solder joint problem needs a bit more than just reheating to correctly fix. Sure, it might work for awhile but it's not worth the risks and you're not really fixing the root issue (bad solder).
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OK what to do here. First I would check the power button and the power lines from the outlet to the power supply checking the voltages. It's also possible your new supply is bad.
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OK what to do here. First I would check the power button (try to manually short it on the logic bd) also check the power lines from the outlet to the power supply checking the voltages. It's also possible your new supply is bad.
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Your system should have a set of diagnostic LED's on the logic board I would check them out as well here.
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Sadly, your system does not have a set of diagnostic LED's on the logic board.
From what you state I'm not sure your issue is a logic board problem here.
But to answer your question on baking your board people do strange things and because it appeared to work assumed they fix it. Sadly, a cold solder joint problem needs a bit more than just reheating to correctly fix. Sure, it might work for awhile but it's not worth the risks and you're not really fixing the root issue (bad solder).
OK what to do here. First I would check the power button and the power lines from the outlet to the power supply checking the voltages. It's also possible your new supply is bad.
Your system should have a set of diagnostic LED's on the logic board I would check them out as well here.