PowerMac G4 (FW800) Dual 1.42 freezing

Hi there,
my PowerMac drives me crazy. Always, especially saving or importing movies (QuickTime or iMovie) the system completely freezes. No mouse-movements or keyboard-reaction. Just "hit" the powerbutton and restart the Mac again.
Importing MPEG4 H264 after around 1 GB, DV format after 4 GB... But these are just examples. I get freezes with other applications either.
It is not software related. Tried Tiger, Panther, Jaguar.. every version with typical software maintenance. (single user modus, reset nv- and p-ram...)
Hardware:
- removed any RAM (4 x 512 MB)and switched them around. Bought a new one and tested every slot. (memtest)
- tried disk utilities
- tried disk warrior and tech tool pro and AHT
- tried another harddisk, also the other ata cable
- replaced the processor with new heat sink (the processor was never overheated. Always around 45 degrees celsius.
- tried another graphic card without ADC.
- worked with Superdrive disconnected
- no pci-cards istalled or external devices.
- tried different usb ports for keyboard/mouse
- changed battery
What else can I do...?? It is really disappointing.
Any help is appreciated.
PowerMac G4 FW800 Dual 1.42 Mac OS X (10.4.3)

I occasionally experience keyboard/mouse lack of response.
Try disconnecting the keyboard/mouse. Count to 10, reconnect, count to 10 again.
Do they work now?
Since you know the when of the freeze, then it also might be worthwhile to have activity monitor open to see what application/process is acually consuming all the processor cycles. Is it always the same process?
How long do you wait before the hard powerdown? It's possible that (whatever) program is post processing your (presumably quite large) video file, and it's just taking a some time to do that task. (thus the activity monitor idea)
Do you also see lots of disk activity when the system seems to go to neverneverland?

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I'm not sure though if 80C is normal for a G5 or not. I noticed that when it was unplugged that it wouldn't retain the time
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Have you blown the dust out of everything with high pressure air?\
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Memtest OS X...
http://www.memtestosx.org/joomla/index.php
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http://discussions.apple.com/message.jspa?messageID=13240047#13240047
https://discussions.apple.com/message/15223603#15223603
https://discussions.apple.com/message/15499912#15499912
https://discussions.apple.com/message/15613068#15613068
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http://lowendmac.com/ppc/power-macintosh-g5.html
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http://eshop.macsales.com/item/Newer%20Technology/CR2032/
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/
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