My girlfriend's white 500 has always run with the lid closed as long as the external monitor plugged cable is in. Even if it is not connected to a monitor.
When Apple ditched the clamshell design they added a small fan to the iBook, so I think it could run with the lid closed.
Okay so I checked on <a href="http://forums.macnn.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=13;t=002942#000000
" target="_blank">another forum</a> and it seems that you have to have the monitor cable connected and
be running OS 9.1. Apple killed this functionality off in 9.2/X.
Apologies for assuming that what works for me will work for everyone.
[ 06-11-2002: Message edited by: Michael Grey ]</p>