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Yosemite installer puts screens to sleep

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dbf

Joined
Dec 30, 2015
Messages
14
Motherboard
GA-Z77-UP5-TH
CPU
3,5 i7
Graphics
GTX 780Ti
Hey!

In the process of updating from Mavericks to Yosemite using the tonymac86 guide, I get to the boot menu - select the bootable USB, the installer (grey with white apple) appears and runs un the progressbar for about 10-15% before either my computer or my screens go into sleepmode, my screens is in the standby functions they normally would be when my computer is powerd off, normally in mavericks I'm using a Nvidia Card and webdrivers, is there a need to go back to internal graphics in bios and osx drivers before being able to proceed the installation on USB?

Thankful for any ideas and help
 
boot verbose mode so you can see what is happening behind the Apple splash screen
 
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