Missing Resolution: Apple Intel HD 3000 graphics in iMac mid 2011

Hi,

Due to AMD Radeon HD 6750M 512 MB malfunction on my iMac mid 2011, I moved all the AMD* file from system/library/extension to a different library.

After the reboot, I can only see 1 resolution (1280 x 720) from the scaled list. Did anyone who can tell me what file is missing and where to find them so that I can see the other resolutions (1920 x 1080...) in the list. Thanks.

Regards,

HC