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When load progress half done iMac shuts off. No keyboard, mouse or optical drive response.
The logic board is getting power. Hard drive and fans run. No keyboard or mouse response.
I tried disconnecting AirPort, video cards and optical drive and still have some issue of shutting down after a minute
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I would try removing all detachable devices such as hard drive, usb hubs, camera cable, wifi card, keyboard, mouse and any other connector except the monitor. Then try running the mac and see if the computer shuts off after the same time it does when the hard drive was connected. If it doesn’t, try using a different hard drive with OSX installed and see if that’s the issue.
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@funkaddict - From what he posted it appears he has already done that with no change.
It was the Seagate hybrid hard drive
@Robert Kondyra I'm glad you found the issue. I would recommend a pure SSD drive. Kingston has reliable and fast SSD's at nice prices.
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What does the onboard diagnostics LED’s telling you?
Locate the tape covered LED’s
What do you see?
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Only 1 light on the logic board is on
If its the most left LED, LED#1 Then your power supply is bit the dust.
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