Clamshell Mode With 30" Apple Cinema HD Display

Hello,
How can I use my 17" MacBook Pro with my 30" Apple Cimema HD Display in clamshell mode (with lid closed). I can only use it in clamshell mode when the AC adapter is plugged in. When I try to wake the computer from battery, it turns on but then goes right back to sleep mode.
Thanks in advance,
Edwin

That's normal behaviour… clamshell mode will not work when your MBP is running without AC power.

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