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Running PowerBooks without Their Internal Display

dcr

68020
Not sure the best place to ask this but since it's not 68k or PPC or Intel specific, I figured this would be the best place to ask.

Can running a PowerBook/iBook/MacBook without its screen and using the external monitor port instead damage the logic board?  I seem to remember some models having issues (overheating maybe?) if you had an external monitor attached and were doing screen-intensive tasks that taxed the video system.  Can't remember if that was if the displays were mirrored or what the circumstances were; I only recall there were issues of some kind.  But I've not heard if running an external monitor without the internal display would cause problems, presumably because you generally wouldn't be doing that.

I'm curious because I have a couple models with decaying plastics and I had thought that, since the plastics are in poor shape anyway, I might make custom cases for them.  And, in cases where the screens were no longer in good condition, I would use the external monitor port to connect a display.

 
It was more for cooling considerations that some PowerBook and MacBooks didn't support "clamshell mode" (that is, using the laptop with the screen completely closed running an external monitor/keyboard/mouse/other peripheral).  Check your model online to see if clamshell mode is supported; some could have this enabled unofficially but this could cause overheating.  If you're planning on something custom without a monitor, there is no damage by running an external display only.

 
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