Macbook pro retina quit working with external displays

Just got a new external display, and can't get it to work with my MBP. I tried it via the mini display port and also via the HDMI connection. Then I tried to use my flatscreen tv just to test things out via HDMI and now that doesn't work either, I've done that quite a bit in the past. The only thing thats changed is I updated to Yosemite. I even tried different cables.
Thoughts?
Txs,
Jeff

When I unplug the cable from the mac, the monitor does display this message:
"No Display Port Cable"
So it does seem like the display knows that its connected to a mac, just nothing shows up. Don't get anything in System Prefs > Displays either.

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Macbook Pro won't work with external display?

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Thanks for the input. Yes, I've driven the 23" with another Mac. I took the laptop back to the shop today. Hopefully they can resolve the issue.
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It sounds like you've already done most of the pertinent steps here:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
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If you tried all of these steps for your display and the video issues persist, contact Apple technical support or take your Apple computer to the nearest Apple Store or Apple Authorized Service Provider (AASP) for diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).
Note: Diagnostic fees may apply for issues not covered under warranty or the AppleCare Protection Plan (APP).
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external display: Acer k272HUL 1440p display.
tested ports: Hdmi, Mini displayport, displayport, thunderbolt to HDMI,
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workaround: I have a external gpu connected by thunderbolt to pci-express. The monitor works normally with external graphic card.
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Only Quick Start Guide is available.
It will take a while to download.
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https://manuals.info.apple.com/MANUALS/1000/MA1679/en_US/macbook_pro_retina-15-i nch-mid-2014_qs.pdf

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Thanks but I tried using another cable but same result. I do get a signal when I set it to 1080p but it looks awful. When I try to set it to the external displays native resolution I lose the signal.
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DALE

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Hello Betty7,
Please let me take a moment to say "Welcome" to the HP Forums.
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Click the “Kudos Thumbs Up" at the bottom of this post to say “Thanks” for helping!
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Is it true that the new MacBook Pro retinas got issues with latency?

I'm thinking of ordering the late 2013 MacBook Pro Retina 15 inch, with 2.6 Ghz, 16GB RAM , 512SSD
I'm gonna use it mainly for live keys sounds using mainstage, logic, omnisphere, ableton etc. After reading a forum, I found that the new macs are pretty bad with latency, is this gonna be a big problem...suggestions?

We don't know. Anything you see on a rumor site like Apple Insider is just that - rumor. No one knows when new models will be released until Apple makes a public announcement. If you wish to base your decisions on the rumor mill then do so, but we cannot tell you whether they are valid or not.

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Hello,
When I'm in my home office, I often use my MacBook Pro Retina in Clamshell Mode (in a BookArc) with external displays.
Originally, I used 2 external displays (2x 1920x1800), and the fan speed and temperature remained stable at the lowest end of the spectrum (around 2200rpm and 60°C). However, recently I decided to use all the ports available and plug in an extra monitor (1680x1050) for that extra screen real estate. I can tell you that having three external monitors really makes a difference to my productivity. However, just by adding this extra display, the fan speed boosts up to a minimum of 4500rpm and often goes up to around 6000rpm. The temperature is also high (I guess the fan speed is a symptom of this).
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I've managed to get the fan speed down to a reasonable, less audible level by using that old VRAM terminal command to enable me to keep the internal display disabled whilst the lid is open. I've had to shift quite a lot round on my desk to make this happen, but I guess it was the only way. It now runs 3 screens under similar loads at approximately 3500prm.
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I have an HP 2311x as well. I'm using an HDMI cable and am not having any issues getting the screen to display. I know you said the cable works with a PC but have you tried a different HDMI cable just in case. It might be worth a try. Other than that, I'm not much help.
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Macbook pro retina quit working with external displays

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