My iMac crashes every time I play a video

Everything else works fine - I can surf the internet for hours, I can chat for an eternity - but as soon as I watch a DVD, or something on YouTube, or I watch a trailer, or even if I have the visualiser on in iTunes - I get a kernal panic, or the "your computer needs to be shut down" screen.
I vaccuumed out the top and bottom vents, thinking this would help. And it did - for one day! Now it is right back to square one, so to speak.
I haven't upgraded my computer for quite a while - the memory has been in there for about a year, and this just started happening recently. I don't have anything physically connected, because everything is on an Airport network. And this was happening before I connected the Airport.
Ideas? Thanks in advance...
Ross
iMac 17 flatscreen G4 1Ghz   Mac OS X (10.4.9)   1.5 gigs of RAM
iMac 17 flatscreen G4 1Ghz   Mac OS X (10.3.9)  

Hello, 
Sorry to hear of your woes. The best thing to do is work through Dr Smoke's Kernel Panic Resolution guide (link) step-by-step. This may end up involving clearing your hard drive so back-up all your data to external drives/discs now.
Let us know how you get on.
mrtotes

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