Download>Click install>30 seconds later it reboots>Apple logo gray screen I see "installing software updates" and a status bar that gets 25% of the way done and then the screen goes black, fans go high, then a reboot>screen is still black, fans go high, 3 minutes another reboot>screen is still black, fans go high for 30 seconds and now nothing for the past 10 minutes.
Power light is on, caps lock key does light up, the keyboard lighting comes on if I touch keys and I can increase or decrease that lighting with the proper key, but no backlight. WTH?
OMFG, now 15 minutes after starting, more fan noise for about 30 seconds...
So it's still doing something, but with a black screen.
No change 35 minutes after starting the update...