Weird problem with Macbook Pro 15" and Asus PB278 monitor

[Gatobolo]

Hi there

I recently bought a brand new MacBook pro 15" the one with a dedicated nvidia 750 vid card. However I'm facing weird problems while connecting it to a external monitor Asus PB278 (1440p monitor). I use a mini display port to display port cable.

My problem is: Sometimes it works perfectly, but then if I put the laptop to sleep, sometimes it won't recognise the screen at wake up, at first I tried to restart the system, power on and off the monitor, connecting and reconnecting the cable... nothing worked. I even bought a expensier cable thinking it was probably a low quality cable. I found that then only way to fix this is to connect the monitor with a mini display to HDMI cable I have (won't support over 1080p), and then put the mini display to display port cable again... it is freaking bizarre.

This is very frustrating, I live outside the US and while the retailer will honor the guarantee I'm not sure if this is a Software or Hardware problem, It will take them about 3 weeks to replace my system which is unfortunate due to I have plenty of work to do. I don't want to send it on guarantee just to find out hey... display recognition is broken again. My questions are:

Is there a way to know if this is a hardware or software problem?
I've heard Yosemite is having some issues regarding external displays, is this one of those?
Have you found yourself experiencing this problem? Could you fix it?

Sorry if my english is a bit weird, thanks in advance.

MacBook Pro with Retina display, OS X Yosemite (10.10.2)

 

[duervo]

Try SMC reset (may have to do it a few times).

http://support.apple.com/HT201295

Indicators

After performing normal troubleshooting, these symptoms may indicate that an SMC reset could be necessary.

...

Video

• A computer that supports target display mode does not switch into or out of target display mode as expected.
• A computer that supports target display mode switches into or out of target display mode at unexpected times.

 

[Gatobolo]

Try SMC reset (may have to do it a few times).

http://support.apple.com/HT201295

Hey man thanks, I did the SMC a few times with no success, then I read about another guy having the same problem... apparently plunging and un plugin the asus screen fix it for both of us...

bizzarre.

 

[jar349]

I created an account just to confirm that I also have 2 of these monitors and only 1 was working. I tried everything and in the end the only thing that worked was to physically unplug the monitor (from the monitor end) and plug it back in. Wild and completely frustrating. How long has it been since unplugging and plugging back in has been a reasonable thing to consider? 15? 20 years?