HT205004: About the OS X Yosemite v10.10.5 Update
Learn about About the OS X Yosemite v10.10.5 Update
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Helpful answers
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Aug 25, 2015 7:36 PM in response to willw3by Carolyn Samit,"It will not respond to any key combination whatsoever.:
Unless you tell us which key combinations you've tried that didn't work, we have no way of knowing.
See if you can boot in recovery mode.
Startup your Mac while holding down the Command + R keys.
From there you should be able to access the built in utilities to verify and repair the disk if necessary and restore OS X using OS X Recovery.
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Aug 25, 2015 7:38 PM in response to Carolyn Samitby willw3,HI Carolyn. Hard to explain but no published startup key combinations work. There is no startup sound, no apple logo, just a light grey screen. Shift does not work. Zapping the PRAM doesnt respond. Option doesn't work. D doesn't work. Command R doesn't work.
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