IMAC 27 inch as external monitor for PC issue

I'm not able to use the iMAC 27 inch as external monitor with my PC which has ATI 5870 graphic card. I use DP (displayport)-> miniDP cable. Any help?
Thank you.
M

It appears that none of the ATI HD 5XXX series cards are compatible with the iMac unless they have a mini displayport connector (ie eyefinity models and the $700 HD 5970). The ATI HD 4xxx models with the full size display port do seem to work also. I am curious as to whether this incompatibility carried over into the new iMac models....

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