Q: a verticle red line suddenly has appeared on my monitor
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Feb 15, 2015 9:16 AMby sterling r,Hi there camoroso2,
If the red line is still there, I would use these troublehsooting steps from the following article about troubleshooting your built in or external displays, named:
Apple computers: Troubleshooting issues with video on internal or external displays
Reset the system
You can reset the Mac's parameter RAM and SMC.
Reset the resolution
Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
- Start up in Safe Mode.
- From the Apple () menu, choose System Preferences.
- Choose Displays from the View menu to open the preferences pane.
- Select any resolution and refresh rate that your display supports.
- Restart your computer.
Thank you for using Apple Support Communities.
Regards,
Sterling
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Feb 15, 2015 5:58 PMby a brody,A line such as that could mean an issue with the inverter cable. Note, Yosemite has nothing to do with Classic. Inverter cable uses are typically only on LCDs and LEDs. If it doesn't go away with Apple's advice, have your inverter cable or board looked into.
And use this tip to learn where to post:
