Mini DVI to Video: blue screen after disconnect

Hi,
can't find a solution: after disconnecting the mini dvi to video-adapter I always get a blue screen and I need to restart my brandnew 20" iMac.
I use it to connect my (old) television via s-video. It is clear that I bought the right Mini-DVI-Adapter.
Can anyone help or has the same problem?
iMac 20"   Mac OS X (10.4.8)  

Thanks for the help. I'd figured out that shutting it off would keep it from happening and was probably a "best practice," but since 90% of my television watching is from my eyeTV, I'd be turning it on and off a lot.
The only problem with leaving the setup plugged in, is that as soon as the mini DVI cable is plugged in, the resolution on the iMac resets itself to super-large fit for television mode and becomes virtually unusable as a computer, thus when I want to use my computer, the cable has to be unplugged....unless of course you know something I don't
Thanks,
Shaun

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