Screen flashes and no boot when DVD is inserted!

I have a new (2 months old) iMac. My wife put in a SIMS3 DVD and weird things started happening after that - the screen would flash, and then eventually go black. I took it to the Apple Store; they found a bad hard drive and replaced it, unfortunately ignoring completely the things I told them about the display going wonky. They gave it back to me and when I brought it home it seemed fine. I then put in a 10.6.3 Install DVD (for the purpose of restoring my whole system off a Time Machine backup) and again - it won't boot (whether or not I'm holding C to boot off of it) and the screen is going wild - flashing on and off. I managed to pop the DVD out (holding down Eject key during boot) and then it booted fine. So: what does it mean that the thing won't boot when a DVD is in the drive? Are there heating problems of some sort perhaps? Why would both the hard drive and the video/DVD drive be bad? Am I missing something? Ideas welcome! thanks in advance,
Mike

Duh!!!!
Thanks Dave. I was converting some of my DVDs to .m4v files for iTunes/AppleTV and set it to Ignore. Changed it back to Open DVD Player and all is as it should be.
Thanks again,
Kirk

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