Create display override file to force Mac OS X to use RGB mode for Display. Mac mini, Mac OS X (10.6.8) Posted on Nov 26, 2018 7:31 AM Reply I have this question too (785) I have this question too Me too (785) Me too. Method 1: Remove and add the Wi-Fi interface. Erase the Wi-Fi interface, please make sure that Wi-Fi is selected on the sidebar. Once done, click the minus (-) sign just below the left corner of network preferences to remove it. Once you remove the interface, you can then create a new one to add your WiFi network. Press the power button and hold it for 10 seconds. Release the button. Press the power button after a few seconds to turn on the Mac laptop. If your notebook computer problem continues: Shut down the Mac. Press and hold the right Shift key, the left Option key, and the left Control key for seven seconds. On the laptop keyboard, press and hold Control-Option-Shift (your Mac might turn on). Hold these keys for 7 seconds, then press and hold the power button. If your Mac is on, it will turn off while.

Just as I thought that Mac was having it perfect in the area of screen resolution and detection, suddenly my MacBook Pro started to display a slightly zoommed-up screeen where I needed to bring the mouse to the edges of the screen to move it a bit and see the rest of the display.
Tried with the regular screen resolution tool in System Preferences but to no avail.
After looking in Internet for a solution I came across this solution which I feel is worth noting here in this blog. Thanks to the author (gingy22) which wrote it for MAC OS X Leopard but is applicable to Snow leopard as well.
Original Link: https://discussions.apple.com/message/8912034#8912034

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Here is the extract:

First, try to reboot in safe mode.
– To do that, turn your system off, then restart.
– When you hear the startup tone, hold down the shift key.
– Release the shift key when you see the “spinning gear” on the startup screen.

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The file named Library/Preferences/com.apple.windowserver.plist contains the resolution that the System tries to use at startup. Deleting this file helps generally.
If this solves the problem during the reboot, but not in your user account, a similar file named “com.apple.windowserver.XXXXX.plist” exists in your own /Users/<yourname>/Library/Preferences/ByHost folder. You can remove this file to get back the standard resolution in your user account.

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If nothing above works, try to press the “reset” or “factory defaults” button in SwitchResX Control for your monitor(Separate proprietary Panel tool). This will delete all changes that you have made for this monitor.

As a last resort, if you can’t even start SwitchResX itself, you’ll have to delete the monitor profile that you modified when you created a new custom resolution.
This file is located in /System/Library/Displays/Overrides/ and is the last modified file, that you can find if you sort by date. You should remove this file. You can access the file system, either by:
1) accessing the file system from an other Mac on the network, from ssh or by mounting a shared folders.
2) OR starting up in single user mode (or safe mode)
3) OR at last resort: reinstalling the OS above the existing install, which will keep your existing profiles, but remove the system modified files.

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Happy computing again.