The last few days my MacPro G4, 17 ", i.o.s. 10.6.8 keeps freezing up. Neither the keyboard nor the mouse work. I have to manually shut the machine down and then start again. Any ideas???

Any suggestions would be most appreciated.. My operating system is OS X 10.6.8.

Model Name:          MacBook Pro
Model Identifier:          MacBookPro4,1
Processor Name:          Intel Core 2 Duo
Processor Speed:          2.5 GHz
Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache:          6 MB
Memory:          4 GB
Bus Speed:          800 MHz
Boot ROM Version:          MBP41.00C1.B03
SMC Version (system):          1.28f3
Serial Number (system):          W88114P4YP3
Hardware UUID:          5773D60A-90A8-550D-850F-F90248A22424
Sudden Motion Sensor:
State:          Enabled
Mac OS X version 10.6.8
Hope this clarifies things. It works well for about an hour or so and then freezes up. Once it was like a screen coming down with a ticking sound. Scary! Thanks for your help.

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