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Finally I bought two cables mini DisplayPort (from my MBPro) to DisplayPort (to the display) without any short adapter, I’ve connected directly to the display and doesn’t work! I can see on the dell display: No cable dvi2. O supposed that someone before configured the dell display to “read” only...

Yes I´ll buy one of it. Thank You for your help!

Well. After 5 min disconnected from any cable, I connected the power cable only and I managed to turn on the display. I can see this message: So, the display is ok. I was trying to connect Mini Display to HDMI and nothing is changing. So I think I need the MiniDisplayPort to DVI adapter...

Sorry for the late reply @DeltaMac, i was busy during weekend. So, I did exactly what you mentioned. And after disconnecting all cables, I connected just only power cable and pressed power button on display, and only one thing that happen, I can hear sound like piiiiiiiiiiiiii continuously...

I can't access to those settings. The monitor display is black, always! I can't wake him up in any way.... :/

The Dell Monitor it's from 2011 more or less, I don't remember exactly , and the laptop is from 2015, if you wanna know those details. I've tried those steps few times already. And nothing change. I think the Dell monitor entered into save or sleep mode few months ago with different computer I...

So, at first i've tried with that cable : also without positive results :/ then I bought Mini DisplayPort to HDMI. And nothing changed....

Thank you for answer. I'm using Mini DisplayPort to HDMI : I'm trying to connect MacBook Pro 2012 and MacBook Air 2015 11" But the dell can't wake up. Have you seen my screenshoot in post before? Any idea how to do it ?

Hi guys. I just wanted to connect Dell U2711 to MacBook Pro/Air and I have the same situation us @krianz My macbook recognize the display and resolution but can't wake up the monitor. Even I can't turn him on. Look @ the screenshot: I'm trying to connect with thunderbolt to hdmi cable...