Mac pro 8 core 3.1 randomly freezes after video card upgrade

Hi,
I just installed an ATI 5770 as a video card upgrade, plugged my new LED cinema display 27 and everything seems to work fine.
Sometimes though, while working with Aperture I noticed the Mac Pro just freezes, although the mouse works, I cannot do anything and I'm forced to press and hold the power button for a reboot.
This happended randomly 5 or 6 times in a couple of weeks and only while working with Aperture.
Any thoughts? Anyone having the same issue?
Thanks for your reply.
Guido

Running Lion or SL?
Tried holding Shift key down and do a safe boot after those freezes.
Use Disk Utility from another boot media to repair your drive.
Do you have enough RAM? is Aperture library on non-boot drive? Does it have 30% or more free? more is better. Same for the boot drive which sholdk be small and 50% free.
Corrupt library. Corrupt preferences (if there were none before, there likely are now after those hard restarts, to data files and to the disk directories).

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Message was edited by: Eric Eskam

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I'm hoping somebody can help me.
I have a HP m8070a Media Center desk top computer.
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