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iATKOS 10.5.4 + GMA950 resolution lock is gone Not com.apple.Boot.plist but New AppleIntelIntegratedFramebuffer.kext is the real culprit. There seems to be Something wrong with /System/Library/Extensions/AppleIntelIntegratedFramebuffer.kext Check version of yours. On terminal > cat /System/Library/Extensions/AppleIntelIntegratedFramebuffer.kext/version.plist New one ... <key>SourceVersion</key> <string>52821</string> ... Old one .... <key>SourceVersion</key> <string>42028</string> ... If yours is New one reinstall Old one will do. Luckily iATKOS 10.5.4 has Old AppleIntelIntegratedFramebuffer.kext backuped. o Old one is /Library/Backups/AppleIntelIntegratedFramebuffer.kext o New one is /System/Library/Extensions/AppleIntelIntegratedFramebuffer.kext Reinstall Old one. After installation check version.plist. On terminal > cat /System/Library/Extensions/AppleIntelIntegratedFramebuffer.kext/version.plist ... Can see Detect Display Button also all available resolution list will reappear. Good luck!