Mac Min fails to reboot after driver install

[MAOJC]

tried the 1.8 alpha on my I7 core mac mini server with 2 hp LP2465 rotated. after driver install the box failed to reboot with the USB attached. Removed the connections and the box now boots.

attaching the display after reboot it comes up landscape rotated. No combination of option/command keys at any point offers to rotate the display.

Attached is a output from your debug tool.