Troubleshooting Horizontal Lines on Your iMac Screen

Some iMac users have reported the appearance of horizontal lines on their screens, often after the warranty period. If you encounter this issue, several troubleshooting steps can help restore your display. These lines can be disruptive and concerning, but there are potential solutions before resorting to expensive repairs.

Software and Hardware Fixes

  1. Disable Auto-Brightness: Fluctuations in brightness can sometimes cause lines. Disabling this feature may resolve the issue. Access this setting through System Settings > Displays.
  2. Restart Your iMac: A simple restart can often clear temporary software glitches that may be affecting the display.
  3. Use an External Display: Connecting an external monitor helps determine if the problem is with the iMac's internal display or the graphics card. If the external display works correctly, the issue lies with the iMac's screen.

Professional Repair

If troubleshooting doesn't resolve the issue, contact Apple Support for an LCD replacement. They will guide you through the process and provide a quote. Having AppleCare+ may cover the replacement cost. Remember to back up your data before sending your iMac for repair. For related information, check out articles on Pro Display XDR 2, Apple's M4 Mac lineup refresh, and deals on discontinued Apple products.