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yosemite grey screen

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Joined
Jul 11, 2012
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26
Motherboard
ga-h77n-wifi
CPU
i5 3570k
Graphics
gtx650
Mac
  1. iMac
Classic Mac
  1. 0
Mobile Phone
  1. iOS
Followed guide to letter for upgrade from mavericks on a ga-h77n-wifi, works perfect in mavericks but boots slowly and about 3rd of way through throws up a grey screen with a small circle with line through it. Has anyone figured out possible cause or fix yet?

Thanks in advance.
 
Followed guide to letter for upgrade from mavericks on a ga-h77n-wifi, works perfect in mavericks but boots slowly and about 3rd of way through throws up a grey screen with a small circle with line through it. Has anyone figured out possible cause or fix yet?

Thanks in advance.

Are you in AHCI mode in your bios?
 
Removed multibeast Kext Dev Mode, now it works
 
Make sure that your USB stick with Yosemite on it is plugged into a USB 2 port, not a USB 3 port.

I was having the same issue and this instantly fixed it.
 
i have its screen and no start yosemite IMG_1368.jpg
 
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