Guest MikeDavies99 Posted May 24, 2022 Posted May 24, 2022 Forgive me in advance. This subject has been covered a lot. I have a Mac Pro 5,1. It started acting flaky, you would have to try once or twice to make it startup. Then it booted and ran like a top. I left it on for months, only rebooting it when necessary. It finally refused to re-start, so I started trouble shooting per the Tech Manual. When you press the Diag Button, the yellow 5 V light comes on. When you press the power button, it lights, the fans spin, after 5 seconds or so the power... Read more Source: MacRumors
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