Mac mini 2014 won't wake monitor via HDMI

Hi ijurisic

Thanks for the answer. I must try XBMC, I hadn't heard about it before you wrote about it. I'll get back later:-)

Hi everyone -

I was having the same problem. Dell monitor (model S2340L) not detecting a signal from the HDMI port after I wake the mini. Very frustrating.

This may not work for everyone, but after changing my HDMI cable the problem is not happening and the screen wakes straight away. I was previously using a cheap Duronic HDMI cable. Not sure of the new cable make (I was previously using it on my Apple TV so don't have the packaging anymore), but it says on the cable that it's a "high speed HDMI cable with ethernet". It is much thicker than the cable that didn't consistently work and it feels of a higher quality.

Hope this helps (some) others. Sam

I've been having the same issue, as well as sound going out between my new Mac Mini 2.6GHZ/8GB/1TB HDD with an Acer Monitor. AppleCare has been wonderful trying to figure it out, and has replaced it TWICE. Same issue on all three. Speakers go out, then come back when unplugged and plugged back in. Same deal with headphones. Apple assumed speaker port, then software, so I did a clean install and ran just OSX without my apps and files. Still had issue with sound. Also doesn't wake up, and need to turn off monitor to wake up. Still waiting for a resolution. I have a call into my Genius Bar guy now that I've discovered so many others having an issue.

I have same problem too.
i use mini display port adapter > dvi

I was having major problems getting my monitor to wake (connected via HDMI to a 2014 Mac Mini), but I appear to have resolved it by changing a setting on the monitor. I turned off CEC, which had been set to on by default. On my BenQ monitor this was done via: Menu - System - CEC. I don't know what CEC is supposed to do, but it seems to be linked to the problems I was experiencing.

Have same problem, but WORSE. Fails to send signal to monitor BOTH on new boot, AND on trying to wake from sleep (both situations about 75% of the time). MacMini Oct 2014 with OS X 10.2 From day of purchase, no signal to monitor using DisplayPort to DVI on HP Monitor. Checked settings on monitor, no change. Moved mouse around. No change. Clicked keys on keyboard, no change. Held ON button of Mini to cause a shutdown and reboot. After about 3 tries, finally got a signal to monitor and all operated well until I turned it off. Purchased a new and expensive NEC Multisync EA244wmi monitor, no fix. Tried changing to a HDMI cable, no fix. Tried various energy saver settings, no fix. I have to deal with this 5 days out of 7. What I get when turning it on in the morning is hearing a ding dong, the HD running, but nothing more happens, no Apple logo on the monitor, which shows a no signal alert. When trying to awaken from a sleep, it is a dead brick. In both cases, I keep drying a shutdown and waiting 10 seconds to boot up again. Sometimes it does, sometimes not.

The Apple site support references, about not awakening from sleep are mostly about laptops, are nearly useless. And no helping points on the problem of unable to send signal to monitor when doing an original boot. I have read strings of posts about these issues and tried various ideas and there has been zero improvement. I am very, very disappointed in the MacMini, as I had a MacBook Pro prior which had only 1 problem in 4 years. With my MacMini, right out of the box, that won't send a signal reliably to the monitor, there is nothing to see to do a diagnostic - it is a brick. Rebooting 3 or 4 times, unplugging cables and replugging, when I took it out of the box, in frustration I came close to taking it back to Apple under warranty, a 50 mile trip which is why I have not yet done it. After hassling with this for a few months, I am getting ready to return it under warranty, and to refuse a like replacement, based on what I have read here - and then consider reverting to a MacBook Pro or an iMac.

I'm having the same problems with a brand new Mini running Yosemite.

The only difference is, that I'm using a VGA monitor driven from a

Thunderbolt port via an adapter to VGA. I occasionally see the messed

up colors on the display and the only way to clear it is to restart. This

occurs after a wake from sleep.

Same problem with new 2014 mini (OS 10.10.3) <> Asus MX. Called Apple support and this OS fix from Kieran worked.

From OS Library, trash

- /Library/Caches

- /Library/Launchagents

- /Library/Launchdaemons

From user library (hidden in Yosemite(!) - requiring you to select Go and hold cmd to reveal it in dropdown menu); trash

- ~/Library/Caches

- ~/Library/Launchagents

Restart with an SMC reset. Empty Trash. Voila.

Its worked for me with 2 test Sleeps from dropdown.

Not tried it overnight yet but its looking very hopeful...

unless I have to go through the process every day!

Looking forward to trying this today, just picked up my refurbished late 2014 Mac mini on Monday and my Sony VGA monitor has failed every time to wake up from sleep, I would have to disconnect the thunderbolt adapter from the Mac mini and plug it back in to wake up my monitor

When I first took the mini out of the box to set it up with my Sony monitor, it wouldn't load setup and kept restarting, I had to connect it to my smart TV through HDMI to get setup going, Apple must really not want us to use third party monitors

Next day report ...Went to wake it up from overnight sleep - it didn't work. The problem persists with an added issue - the monitor wakes up in greyscale. It returns to colour after a few secs. Pointer/cursor wakes up about 30 seconds later still. Very irritating.

Will call Apple Support again sometime soon ....

P.S. if you do try this Apple Support so-called fix, I must make clear that the Library files to Trash are HD>Library & HD>Go+alt>User Library and NOT System Library. Do not touch those.

PPS When I trashed the files, I then lost browser functionality ( cue 2 hours with Apple Support ! ). Bad luck for me. We finally figured out the issue. I had Glimmerblock (http proxy adblocker) installed and when I ditched the Launch files, Glimmer stopped me getting into websites - so if you have Glimmerblock installed, DO NOT trash these files!!!

It seems that I've solved my problem. (knock on wood) I'm sure exactly what did it, but I did the following

with my brand new Mini;

SMC reset.

Zapped the pram.

Replaced my wireless keyboard/mouse's receiver with a newer model. (Logitech S 530 wireless desktop)

Trashed the MacLoc me application after remembering that it didn't

play well with Lion for the short time I had it on my older model iMac. It was identified on this discussion board

as the culprit for several problems .

Reset the Energy system prefs to default .. disabled screensaver.

My Mini now wakes dependably and the video aberrations from wake I was seeing have not resurfaced.

Thanks to dumb luck, a little research, experience and The Force, I guess.

You could have a USB wireless connected to your wireless keyboard and when you press enter it would wake it up automatically. I do this all the time

I think I may have identified the cause of this problem, if not a cure for everybody.

Have 2 mac minis, one 2 years old, one 2 weeks old. Using one with a LG UDH TV screen with HDMI inputs (no Thunderbolt or DVI) and with a LG 34" UHD monitor with 2 Thunderbolt and 3 HDMI inputs.

The 2 week old (as at May 2015) mini's HDMI port does not have the sleeping monitor problem - that is the only one that will work with LG TV reliably.

The 2 year old mini's HDMI port does have the problem and no combination of cables using HDMI> to anything connecting the LG TV seems to fix it. The brand new port must have a different signal output as the LG TV never goes wrong with that.

My suspicion is the earlier mac minis HDMI ports do not conform to the requirements of some LED TV screens - I think all of the traffic in this forum on this topic may have had an effect on Apple changing the HDMI port settings.

Now if Apple would just bring back a quad core mini, that would be great !

Mini still not waking the monitor reliably (Thunderbolt to VGA via an adapter) I've found that unplugging the cable at the MIni's Thunderbolt port and plugging it back in wakes the monitor every time (so far)

Conclusions; it's not a problem isolated to HDMI driven monitors. It's also a VGA monitor issue. Updating to 10.10.2 or 10.10.3, which is what my Mini came with out of the box, is not necessarily a fix. Apple doesn't have a fix. Wish I'd bought another iMac.

I'm on a late 2014 Mac Mini (1.4ghz) using an HP w2207 monitor with an HDMI to a DVI adapter. I move my mouse and keyboard, the sleep light on the Mac stops blinking, but the monitor doesn't come on at all.