Short guide
- Click the Apple icon in the top-left corner of the screen, then select System Preferences.
- In the System Preferences window, click the Accessibility icon.
- Select Display in the left-hand column.
- Tick the checkbox next to Invert colors
Before and after
This section takes you through each step in inverting the colours used in OSX 10.10, with picture of the screens to help.
Open System Preferences
1. Click the Apple icon 
in the top-left corner of the screen, then select System Preferences.
Open the Accessibility settings
2. In the System Preferences window, click on the Accessibility icon.
Select the Display accessibility settings
3. Click on Display in the left-hand column
Tick Invert colors
4. In the right-hand panel, tick the checkbox next to Invert colors. Click the red Close button in the top-left corner to close the window.
Note: If this does not work it could be because someone else manages your computer settings (an IT department or administrator). If this is the case, you will need to contact them to access these settings or for further help.
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