Replaced logic board now problems
After replacing logic board takes 3-5 minutes to boot up. Also fan continually runs. Keyboard and trackpad not working either. What can I do?
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You may want to review your work, checking the cable connections.
Try using an external USB keyboard and mouse, restart the system and presss on the external keyboard the D key to enter into the onboard diagnostics. Let us know what it tell you.
Reference: Mac startup key combinations
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could be a faulty board that you got
by daniel