IMac no longer lets me watch streaming tv.  Why?

Within the past 2 weeks, whenever I go to watch streaming video--Fancast, hulu, abc.com, YouTube--my computer will go into sleep mode after about 90 to 120 seconds of play. I've changed my sleep mode/display timer to "never turn off", I use DSL/ethernet.
This doesn't happen when I'm browsing the net or reading for extended periods of time. I can watch hour long podcasts and DVD's with no problem.
Who has a solution for me? I'd really like to catch up on my tv shows

To Apple Discussions!
Strange you having sleep problems only on the sites you mentioned & no place else. See if resetting the SMU and/or PRAM helps. Might as well kill 2 cyber birds w/one cyber stone.
http://docs.info.apple.com/article.html?artnum=301733 iMac G5: How to Reset the SMU (iMac G5, the iMac G5 (Ambient Light Sensor), and the iMac G5 (iSight)).
http://docs.info.apple.com/article.html?artnum=2238 Resetting your Mac's PRAM and NVRAM

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