Does connecting a display to DVI without shutting down really cause an arc?

I just got a Wacom Cintiq 12" and their documentation and tech person says I've got to shut down before plugging or unplugging or beware--making the DVI connection with the computer on (or even asleep) could cause an arc and damage the display. I told them Apple support told me the exact opposite a while back, that I should be plugging and unplugging montors while my Powerbook was awake so the computer properly recognizes it. Wacom tech support says they were surprised to hear Apple actually recommending this since that it's dangerous to all displays.
Anyone know the straight scoop on this? I'd hate to have to restart every time. Thanks!

I don't think there really is a straight scoop. Zillions of people plug and unplug monitors every day with no ill effects. However, there is a slight possibility of a problem, which is probably why Wacom specifically warns not to do this. FWIW, my display is a Viewsonic and it, too, specifically warns to have both off before connecting, then specifically to power the display on first, then the computer (to recognize the display).
I think the manufacturers have covered themselves by stating this, so I suggest if you want warranty coverage, you should follow this. Do I do this every time? No!

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