Changing graphic card

[a.piano]

I have PCV-RS404.
Today I bought a new graphic card (the original is ATI Radeon 9200).
The one I bought is Asus N6800 512MB DDR2.
When I turned on my computer it make immediately a strong whistling!!!
I didn't insisted and put the old one.
Does someone know what's de problem?
Is there any incompatibility?
Thank you for your help.

A. Piano
Switzerland