i'm posting this as both a question and a knowledge base really should i discover whats going on.
i have a GT650M that works out the box (no DSDT needed) on 10.9 ad 10.9.1 with no issues. on 10.9.2 however the screen goes black and never gets to the desktop, the computer continues to run in the background.
the display is an internal display (all in one pc)
i've tried this on a fresh install and its the same.
are any other nvidia users having similar issues? or some clues as to where to look on these nvidia things?
EDIT1: i hooked up a display to the HDMI port, which works. so it looks like 10.9.2 no longer supports display type 02 00 00 00 (LVDS). i installed the web drivers and its still the same.
EDIT2: copied the NVDAGK100HAL, NVDAResman, and NVDAStartup kexts from 10.9.1 back over the top and it works again now. not really a fix though.