Clamshell mode with Powerbook G4

it *shouldn't* generate enough heat to be bad but if you're worried you could put it to sleep then wake it up in clamshell mode then open the lid and the internal screen will still be turned off

ive never had any troubles with mine. i put mine in clamshell mode often and just keep nice airflow under the laptop (i keep mine proped up on a carabiner! yeah its cheap, but it works!) so you should be fine with the iCurve. apple knows there is a problem with the iBooks so they are not able to start in clamshell mode, but i am sure apple has done the research to let them know the powerbooks are safe in clamshell mode. come on, apple doesnt want to replace a lot of powerbooks that go bad b/c of clamshell mode!

I've been using my PowerBook with the display closed for a few months with no problems. Apple designed them so you can use them that way - and so there shouldn't be any long term damage. Also, you are right in thinking that all of the VRAM goes to the external monitor when the PowerBook's screen is off.

Here's Apple's support document on the subject:

http://docs.info.apple.com/article.html?artnum=88064