I have similar issue with GT 640. I think I got it after mistake - install inject nvidia.
SOLUTION(manually remove inject nvidia):
mount EFI partition, first go to terminal.
1) "Diskutil list"
This will show you the partitions on your drives.
Find the right EFI partition on your boot drive...
Article: UniBeast: Install OS X Yosemite on Any Supported Intel-based PC
▪ Disk > Trim Enabler (only if you have an SSD)
▪ Audio > Realtek ALC8xx > Without DSDT > ALC887/888b > vXXXX Current
▪ Network > Kext hnak’s AppleIntelE1000e Ethernet
I have graphic: NVIDIA GeForce GT 640 2048 MB -...
was problem with sound in q77m-d2h.
Solution:
Reinstall Sound drivers with multibeast 5.2.1 -> ▪ Audio > Realtek ALC8xx > Without DSDT > ALC887/888b > vXXXX Current
And all working now.
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