Macbook Pro Doesn't Recognize External Monitor

[Night_Wolf]

Hey guys, so I have Macbook Pro retina 15" with NVIDIA GeForce GT 750M and a ViewSonic VX2453mh-LED.

2-3 weeks ago I plugged it in via HDMI cable and MB instantly recognized it, and I could adjust it in Preferences>Display.

I haven't used it since and today when I plug the monitor nothing happens. I tried:
Changing HDMI port on monitor
Plug in and out cables
Leave it plugged in and restarting MB
Holding Command+Option+P+R when booting MB

Thanks!

 

[Night_Wolf]

Bump.

Research on the web indicates that is the Yosemite is the problem. External monitor worked before, but when I did the last update it just stopped working and no solution has worked for me.

 

[Samuelsan2001]

You may have to put the screen in PC mode to get it to work according to a couple of reviews I read.

 

[Night_Wolf]

You may have to put the screen in PC mode to get it to work according to a couple of reviews I read.

Any guide on how to do this? I can't find anything. I can't choose any options on monitor since is turned off without signal.

 

[Samuelsan2001]

No idea I was just going by what the reviews said.

You have the instructions there don't you?? Monitor menus should be accessable without using your computer...

 

[bootz]

Hey guys, so I have Macbook Pro retina 15" with NVIDIA GeForce GT 750M and a ViewSonic VX2453mh-LED.

2-3 weeks ago I plugged it in via HDMI cable and MB instantly recognized it, and I could adjust it in Preferences>Display.

I haven't used it since and today when I plug the monitor nothing happens. I tried:
Changing HDMI port on monitor
Plug in and out cables
Leave it plugged in and restarting MB
Holding Command+Option+P+R when booting MB

Thanks!

Sounds like it may be stuck in integrated (graphics) mode? Have you tried forcing discrete mode so that the 750m is used? If you haven't already done so, download gfxCardStatus https://gfx.io . It allows you to switch between the two cards and will also tell you which is currently active.

 

[Night_Wolf]

Sounds like it may be stuck in integrated (graphics) mode? Have you tried forcing discrete mode so that the 750m is used? If you haven't already done so, download gfxCardStatus https://gfx.io . It allows you to switch between the two cards and will also tell you which is currently active.

Just tried that and it didn't work. Tried all 3 options but no luck.

Any other ideas guys? I tested cables and everything, that's not the issue, it must be something with Yosemite.