My screens just turns off and (what I think is the hard drive) goes crazy!

I recently added an extra 512 ram memory to my intel mac. Ever since the computer randomly shuts of the screen and starts making the sound resembling the sound of an error in a cd or a problem in the disk drive although there is no cd or dvd in the unit. This also may be the hard drive. I have had to disconect the computers power plug to fix the problem.
I am worried if this sound may cause irreversible damage. No idea what is causing it.
intel imac   Mac OS X (10.4.8)  

You will need to reapply the cuda hack, see Ann's answer:
Re: How to activate Cuda with a quadro k2000 into premiere cs6

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