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Yosemite - hangs booting the installer


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I'm having trouble getting yosemite on my Lenovo T440. I followed the Common Problems with the installer and had some success

i5-4200U with HD4400

- enabled kernel pm patch - this stopped immediate reboot

- Add -gux_defer_usb2 -gux_no_idle in Boot Args fixed "still waiting for root device"

- Move video kexts from single user fixed Missing Bluetooth Controller Transport

Now i'm getting hang on line

com.apple.xpc.launchd[1] (com.apple.securityd127) : service exited due to signal: Abort Trap: 6

and not getting to GUI - anyone know what this is? thanks!

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