Freezes without a reason and makes noises

my computer freezes without an obvious reason. A message appears in many languages asking me to hold the start button to reboot.
Then, sometimes, it brings up a white screen where it tells me to type mac-boot. When i type that it freezes... with strange patterns (lignes) on the screen.
Something has changed also for the past few months. A noise, increasing, when i use softwares like maya or cinema 4D. Especialy when i do renders. This noise seems to come from the processor or maybe the fan, i can be sure. It calms down when the render finishes.
Any ideas?
thanks for reading that.

I would guess that if the noise you're hearing is coming from the area underneath the top of the speaker grill(e) on the left it is the fan, and it is normal that you should be hearing it during processor intensive tasks. The processor runs silently, so you can rule that out....
You are experiencing kernel panics
A message appears in many languages asking me to hold the start button to reboot.
Don't hold the power button to restart the machine when these occur. Instead, hold the power button until the machine shuts down. Let the machine sit for a minute, then restart normally.
Open the file, /Library/Logs/panic.log and look for the entries corresponding to the past two or three kernel panics and post them here. Maybe we can see what the problem is.
Also, kernel panics are often hardware-related. Have you added any third-party RAM to your machine. If so, does all of your RAM show up in System Profiler? Do the panics occur with any peripheral devices attached to your machine?
Have you run Apple Hardware Test which is on the Install & Restore DVD that shipped with your computer?

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