System with dual monitors hangs on boot after 10.8.5 upgrade

[VtaHwy73]

I upgraded to 10.8.5 last week-end and after fixing the boot 0:error problem was able to boot from disk. Today the network card quit working so I tried a reboot. Instead of seeing the tonymac boot loader screen I get a text menu:

Darwin/x86 boot v5.0.132 - Chimera v2.0.1 r2109
Build date: 2013-02-19 23:42:16
8089 memory
VESA v3.0 63MB (Intel(R) Snadybridge/Ivybridge Graphics Chipset Accelerated VGA
Press any key to enter startup options. (2)

I remembered I didn't have the second monitor plugged into the HDMI port when I upgraded. Disconnected the HDMI and it boots up with the TonyMac logo screen.

Tried turning off the monitor with it plugged in to HDMI -- same problem. Switching monitor to digital port also does not work.

Any idea how to be able to boot with both monitors plugged in?

 

[pangbrand]

Same problem here.
It works if I unplug the monitor on startup and then plug it in after the OS is up.

 

[escobol]

Got the same problem in mavericks, when i plug scnd monitor to hd4000 i got black chimera without gui....

any help?..