my mb c2d works fine in clamshell mode when ac powered. i can use my dell 24" with the lid closed or open. i can also open the lid and not detect displays so i can type on the keyboard using just the external display. the isight will also work without the mb display coming on (nice feature). while on battery, it will work fine with the 24" AND the mb open so that both displays are usable (either mirroring or separate displays) if i close the lid while in battery it won't wake with the 24". if i am in ac mode with only the 24" and pull the ac power plug to put it in battery it goes to sleep and won't wake. strange that it will power BOTH displays while on battery but NOT with the external display ONLY. anyone else notice this phenomena? or is it just mine?