Major heat problem. should i be able to hear the fans?

my black macbook with 1gb ram is getting very hot when i use front row to play videos at full screen. after about 30-40 mins the left corner of the macbook is so hot i can only touch it for a second or so. then without warning the video just freezes. the picture remains on the screen but looks like it's paused. i then get the spinning colour wheel. the only way to rectify is to force a power off (force quit has no effect). i have to let it cool down for a while and try again. it works fine after that until it gets hot again.
when it locks up, it is completely silent. should i be able to hear the fans working? there is no warm air being expelled from any part of the unit as far as i can tell. the case is just really hot.
i ran a little experiment by pointing a desk fan at the notebook and it played fine for five hours without problems!!! the corner of the macbook was cool to the touch.
this happens in lid closed or open modes.
anyone else have this or is it time to call applecare?
Macbook Black 1gb Ram 120gb HDD Mac OS X (10.4.7)
Macbook Black 1gb Ram 120gb HDD Mac OS X (10.4.7)

UPDATE
ok, so we have had the firmware update and guess what?
all seems ok now!!!!
coreduotemp now reports 65 degrees after playing video at full screen. much better than the 85 degrees it was hitting. now when it gets hot i can hear the fans going. i ran a terminal window and did yes > /dev/null and after only a few seconds the temp was rising to 85-87 and the fans came on really hard and brought it to 68-70. no system stall yet.
normal idle while using only safari over airport is between 41-45 degrees!!!!
i am very happy so far. lets just hope it is the cure.
many thanks for reading and replying.
Martin.

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