I have tried doing what the other posts have said and tried moving/removing kexts. but I got one of two errors. And if no error it's just the greyish white screen with the rainbow pinwheel.
this is the most recent one: https://www.dropbox.com/s/gxw7plpy9wuomgn/Photo%20Nov%2007%2C%202%2004%2023%20PM.jpg
the other is:
SMC::smcReadKeyAction ERROR MSDS kSMCBadArgumentError(0x89) fHashKeyTable=0x0xffffff8025ea1ee0
cpu: i7
Gpu: Geforce 650
motherboard: Gigabyte H77-DS3H