Internal/External displays blank when external connected while sleeping

When I connect my external display to my MBP (late 2011) while it's sleeping, the MBP awakens but both the internal & external display are blank.
The MBP is running ML and is connected to external display via DVI. No response to external Logitech keyboard or internal keyboard. Currently my only recourse is to ssh in from a co-located Vista machine & 'sudo reboot'.
If MBP has recently been used  (say < 5 min or so), everything's fine -- external display fires up & external KBD/Mouse work.
I'd be interested in any way to prevent this problem if I forget to open MBP for a moment before connecting Power/DVI/USB. Alternately, a command
I could issue via SSH to reinitialize display would be great.
Thanks. Kent

Pleased ignore this thread - managed to double post somehow ....? Sorry
Chris

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