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Apple Computing Products:
macOS - Desktop Hardware
Intel Pro Mac lost power unable to power on
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<blockquote data-quote="bjr001" data-source="post: 1586983" data-attributes="member: 267726"><p>This family of Mac has a small button similar to the one located high on the motherboard for resetting the system. This button is located through the top memory riser opening. You will need a long screwdriver or such to reach into that cavity.</p><p></p><p>Next to it are a series of LED lights that show a sequence when the button is pressed. This is what is used to diagnose issues of Macs not powering properly on yet still show some power reaching the mainbd/fans or power off after a short time. This shows if its the MB, PS or CPU is defective. I don't know the codes though you could always call an Apple store and ask.</p><p></p><p>In my case it is simple as the LED's didn't come on as I had no power. I was able to obtain a used PS from a friend for this family of Macs and installed and all worked fine. It's been running fine for days now.</p></blockquote><p></p>
[QUOTE="bjr001, post: 1586983, member: 267726"] This family of Mac has a small button similar to the one located high on the motherboard for resetting the system. This button is located through the top memory riser opening. You will need a long screwdriver or such to reach into that cavity. Next to it are a series of LED lights that show a sequence when the button is pressed. This is what is used to diagnose issues of Macs not powering properly on yet still show some power reaching the mainbd/fans or power off after a short time. This shows if its the MB, PS or CPU is defective. I don't know the codes though you could always call an Apple store and ask. In my case it is simple as the LED's didn't come on as I had no power. I was able to obtain a used PS from a friend for this family of Macs and installed and all worked fine. It's been running fine for days now. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
Intel Pro Mac lost power unable to power on
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