Could the replacement of a fan on a graphics card cause OS issues?

[Dangit - I unintentionally posted this in the iMac forum first - meant to post it here]
OK I suppose it's a bonafide long shot that my replacing of an intermittently malfunctioning fan on a graphics card could cause OS issues, but I've had something immediately crop up after the replacement (crippling issues with Logic's 32-bit audio unit bridge), and they effect older projects that were previously stable, so I figured I'd ask for the heckuvit.
Repairing permissions hasn't helped - I'm just starting to ponder whether to reset PRAM, reset SMC, boot from an HD clone, try reinstalling the old fan, etc., in order to figure out the problem....
BTW - the graphics card is an Nvidia GT120.

Go out and buy an Apple ATI 5770.
What requirements does Logic have for video, and are you still on 10.6.8?
The GT120 is 512MB but low-end card.
If you do need more performance:
SHOOTOUT WITH THE 'SHARKS': Sapphire Radeon HD 7950 for Mac versus really fast alternate GPUs

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    OK I suppose it's a bonafide long shot that my replacing of an intermittently malfunctioning fan on a graphics card could cause OS issues, but I've had something immediately crop up after the replacement (crippling issues with Logic's 32-bit audio uinit bridge), and they effect older projects that were previously stable, so I figured I'd ask for the heckuvit.
    Repairing permissions hasn't helped - I'm just starting to ponder whether to reset PRAM, reset SMC, boot from an HD clone, try reinstalling the old fan, etc., in order to figure out the problem....
    BTW - the graphics card is an Nvidia GT120.

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    The GT120 is 512MB but low-end card.
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