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Apple Computing Products:
macOS - Operating System
Determine what is causing random restart
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<blockquote data-quote="Randy B. Singer" data-source="post: 1808786" data-attributes="member: 190607"><p>You seem to have neglected to run:</p><p></p><p>Apple Diagnostics</p><p><a href="https://support.apple.com/en-us/HT202731" target="_blank">https://support.apple.com/en-us/HT202731</a></p><p></p><p></p><p></p><p>In my experience a grey screen on startup just about always indicates a hardware problem. Though it might be hard to pin down. Most often it is caused by bad RAM, or a failing external hard drive, or an external peripheral (of any kind, even a keyboard or USB hub) that your Mac doesn't get along with.</p><p></p><p>Detach all peripherals, including mouse and/or keyboard if they are non-Apple (and replace with Apple supplied ones), restart, and see if that helps.</p><p></p><p>You can test your Mac's RAM with:</p><p></p><p>Rember (free)</p><p><a href="http://www.kelleycomputing.net/rember/" target="_blank">Rember | Kelley Computing</a></p><p></p><p>If you have third party RAM installed, I'd consider uninstalling it, replacing all the Apple-supplied RAM, and seeing if that makes a difference.</p></blockquote><p></p>
[QUOTE="Randy B. Singer, post: 1808786, member: 190607"] You seem to have neglected to run: Apple Diagnostics [url]https://support.apple.com/en-us/HT202731[/url] In my experience a grey screen on startup just about always indicates a hardware problem. Though it might be hard to pin down. Most often it is caused by bad RAM, or a failing external hard drive, or an external peripheral (of any kind, even a keyboard or USB hub) that your Mac doesn't get along with. Detach all peripherals, including mouse and/or keyboard if they are non-Apple (and replace with Apple supplied ones), restart, and see if that helps. You can test your Mac's RAM with: Rember (free) [url=http://www.kelleycomputing.net/rember/]Rember | Kelley Computing[/url] If you have third party RAM installed, I'd consider uninstalling it, replacing all the Apple-supplied RAM, and seeing if that makes a difference. [/QUOTE]
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Apple Computing Products:
macOS - Operating System
Determine what is causing random restart
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