No "Clam shell" mode with MBP?

I have used powerbook with an external display and mouse with the lid closed (clam shell mode -as they call it). But when I try the same with MBP, I get the display for a few seconds and the mouse stops responding and the system seems to sleep. Waking up with the external keyboard/mouse makes the cycle reapeat - losing the display and MBP sleeping in few seconds.
No problem at all with the external display and mouse when the lid is open.
Any insights?

Do you have the power adapter plugged into the MacBook? If not, it will sleep after a few seconds.

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