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Nov 10, 2013 11:03 AM in response to inireuggby Allen A,Howdy inireugg,
We've an article that provides a host of helpful information and tips for resolving issues with displays.
No video or no signal, image distortion, "snow," or flickering
Check connections
When using an external display be sure to check the following:
- If you're using an Apple notebook, confirm the AC power cable or adapter is securely connected to the computer and the cable providing power to the display is also secure. It is always good to have your notebook connected to AC power when an external display is in use.
- Confirm display adapters are fully seated in their respective connections and that they are supported models and for the computer and display. Refer to these articles to assist you with adapter compatibility and further configuration information:
- Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.
- Try unplugging the video adapter or cable and then plug it back in.
- If more than one video adapter is in use (or "daisy-chained"), troubleshoot by using only one adapter.
- Example: A mini DisplayPort to DVI adapter connected to a DVI to HDMI adapter is an unsupported configuration because there is a series of adapters in use.
- If available, try using a different display and or adapter (or use a different connector by using DVI instead of VGA, for instance).
Reset the systemYou can reset the Mac's parameter RAM and SMC.Reset the resolutionStart 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.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
Cheers,
Allen
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Nov 11, 2013 4:28 PM in response to Allen Aby inireugg,I've pretty much tried everything. Reset PRAM, SMC, Safe Mode, etc. My external motinitor is a Apple Thunderbold Cinema Display and I use the original cable. Again, the screen was working flawlesly before Mavericks. I noticed that some people on macrumors.com are having the same problems. It's definitely a Mavericks problem.
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Nov 12, 2013 6:16 AM in response to inireuggby Allen A,inireugg,
Thank you for using the Apple Support Community. Due to the nature of your issue or question you may find more information by using another one of Apple's support resources - https://getsupport.apple.com/GetproductgroupList.action.
All the best,
Allen

