Mountain Lion doesn't detect displays on startup

I use my MacBook Pro extensively in clamshell mode, and when I did this in Lion, the integrated screen would stay off whenever I turned onb the computer because the lid was closed. However, in Mountain Lion, the screen stays on despite the fact that the lid is closed. Is there anyway to force my Mac to detect displays on start up?

Go to Sys Prefs > Displays > (hold Option) and a "Detect Displays" button will appear at the bottom right. The problem for me it's that even though a display is connected and I managed to get the button to show up, it still didn't detected the display until I unplugged and oplugged back again from the thunderbolt port.

Similar Messages

Why doesn't mountain lion remember my external display settings?

I'm a teacher. I have a 13" early 2011 MBP with mountain lion (10.8.1, clean install on new SSD). I have external monitors in my office and at home. I want them to be the primary when plugged in (with the menubar/dock, and the MBP LCD on the left as the secondary display). When I'm in classrooms, I want the projectors I connect to to be the secondary display (with the MBP LCD on the right as the primary with menubar and dock). Snow leopard remembered all of this for each display. Mountain lion doesn't. Projectors almost always come up mirrored even if I've connected to them before and reset it.
To make matters worse, the displays menubar option is gone in Mountain Lion. Argh........
Ideas?

Ok, I think I found a solution. I disabled the new clamshell mode behavior by using
sudo nvram boot-args="iog=0x0" and rebooting, make it work like snow leopard. Since, it seems to be remembering my 3 displays (classroom projector as secondary on the left, office monitor as primary on the right, and home monitor as primary on the right). The downside is if you connect everything with the lid closed and get only one display, opening the lid does nothing and there is no easy "Detect Displays". Maybe I can write an applescript to easily detect displays.

After installing Mountain Lion doesn't external hard drives mount or stay mounted. Anybody else with this major problem?

After installing Mountain Lion doesn't external hard drives mount or stay mounted.
I have tried resetting my Mac's PRAM but the problem still remains.
Even USB memory sticks are unmounted efter a few seconds.
Anybody else with this major problem?

I have the same problem, although mine has not been solved by ESET update, finder settings, PRAM & SMC resets or anything else.
Don't get it, my external hard drive still works on both my housemates computers - one macbook pro (with snow leopard) and one dell, just not on mine with mountain lion.
Any ideas for me guys?

Mountain Lion doesn't display Finder preview icons for .ARW files? (RAW pictures taken with SONY cameras)

This is something that I find rather ridiculous, and have a hard time believing no-one at Apple has addressed yet.
Basically the problem is that neither Mountain Lion nor Lion show Finder thumbnail preview images for pictures that are taken with SONY digital cameras.
This is something that Snow Leopard, as well as multiple earlier iterations of OS X used to do without any problem. The professional photographer community who uses SONY professional DSLR cameras is up in arms about this. And we've all been crossing our fingers that perhaps the Mac OS X 10.7.1, 10.7.2, 10.7.3, 10.7.4, or possibly the 10.8 update would fix this issue for us.
Several of us have filed bug reports over the past year or two. See this thread: https://discussions.apple.com/thread/3213982?tstart=0
This is a flaw in Apple's operating system. Especially considering that there are supposedly 200+ "new features" which were just released in Mountain Lion.
Those of us who work with SONY cameras every day would probably have paid the $19.99 upgrade price for just one "feature". And not even a new one. An old one. The ability to see our pictures in the Finder. Pretty basic stuff.
Hopefully someone fixes this for us with the release of Mac OS X 10.8.1
Please. And thank you.

I can see image icons for all my pre-MtLion images. These are the folder images (Icons), and all the photo images (icons) on all my hard drives. IE If I have a folder of 300 wedding pictures, they all show the picture image above the file name in the icon view. So if I want to open a picture of the "Flower Girl" I can see the image (icon) of the Flower Girl. Without the image showing all I see is the filename... Smith-212.tif. Now with Mt. Lion I CAN'T see any IMAGES (ICONS) on any of the 300 photos. Just the file names in all the different views.... Icon View, List VIew, etc. If I have a Folder with 23 more folders inside, they don't even show up either. I saw a step by step process of selecting the file and right clicking on it and opening it in Preview, then doing a copy and then pasting it on the original image in tghe get info window. WHAT A PURE PAIN TO HAVE TO DO THIS TO 170,375 IMAGES.
The other issue I have is that 93.5 % of the remaining icons that do exist on my system is that those 93.5 % are so pixelated they appear as a hugh checkerboard viewed through two inch thick glasses..... not for drinking, but the kinda glasses used by a blind man. IE the remaining icons are so PIXELATED it is almost impossible to tell what they are.
BEN WELLAND...... What did you do to get this point?
Thank you, thank you, thank you, to whomever at Apple finally fixed this.
After updating to Mountain Lion 10.8.2, SONY .ARW files (and I'm assuming Pentax .PEF files too) now render proper thumbnail icons in the Finder in list view, icon view, coverflow view, and columns view.
Since this is now a recognized bug, I'm guessing that the free update to Lion (10.7.5) that Apple also just released yesterday (September 19th, 2012) will probably fix this issue too.
Hooray!
I have OS 10.8.2 and nothing has changed as far as being able to see photos / folders as image icons...
rendered proper thumbnail icons.
I have thousands of photo files that show nothing other that the file names.
The only way I can even see the file is to open it in Photoshop, or open the folder in Bridge. Even then after I open it in PS CS6, and save it again. It still is a "Empty" file...... no render proper thumbnail.
icons
Any help will be appreciated.

My Lion woes, panes, detect display

My complaints so far. I am sure I will come to love the new features in Lion though when I get done with my bi', okay, will stop there. Some complaints are dependent on me using screen zooming / scaling all the time due to my distance I sit from my display.
Launchpad in VERY uncontrollable with my logitech performance mx mouse when trying to scroll left and right. It stops for a second and when I go to select an app right then it seems to have inertia from the scroll and bounces back to the opposite end of the 3 panes away from my intended choice. It is non scalable which means I have to lean forward in my chair to view the type. Don't laugh, I am always using the command + zooming mouse wheel a lot as my display is my 24" HDTV 6 ft away. Yeah, I am lazy about leaning up. In a few months I am going to have a 55inch display and be sitting a few feet further away.
The grey direction arrows (active/non-active url direction) in Safari are too similar to each other at a glance. Make them CONTRAST more PLEASE.
Never seen so many color wheels before. A lot of thinking going on.
My arrow mouse icon was flickering and completely disappeared for about 10 seconds.
Screen video capture programs which worked in leopard doesn't work now. (I expect updates, maybe from developers but if not I want a refund for recent purchases).
Screen shot dashboard program does not work. (needs update obviously)
Finder windows with panes have to be constantly adjusted (almost) each time I open them. I haven't figured out why yet.
Autocomplete typing feature inputs the wrong word sometimes and does this even when I do nothing but type as normal! I have had more unintended but correctly spelled words than ever before. Maybe I am doing something wrong.
When trying to select a file to upload in Safari the selection window apparently did not give me the choice to look in all my files, desktop, documents, user. It was as if was unable to show the actual files window. After looking at this again I had to stretch the already big window to find the other pane. This is not good! Reminded my of Windows which I gave up years ago.
(receiving attention from apple as of 7/21)
My current 24" philips hdtv display with PC IN has been used with 2 minis in the past but is not discoverable with Lion and if it tries all video output stops. Great customer support though with this as 2 Tech guys talked to me at length and they sent it up the chain of command to be addressed in an update they think within 10 days at the longest. I am including this in case other ppl have this issue. They are working on it. More on topic : I have to plug in a backup tiny display and then fool the system by then keeping the lower desktop resolution and plugging into the bigger display. Sometimes when the mini sleeps I have to restart with the smaller display and go through tricking the system again. If I try to DETECT DISPLAYS with the bigger display it then stops all display output and I have to restart using the smaller display, etc.
Thanks in advance for setting me straight with anything I am clueless about and Thanks to Apple Engineers if they are looking through these discussion boards for feedback.

Well folks I did find a work around for the time being. Though it doesn't restore my options in the menu button I did uncover the Detect Displays button. I was looking at my post request and behold I saw a related article next to this thread that says OS X Mountain Lion: About the Display pane of System Preferences ( http://support.apple.com/kb/HT5369?viewlocale=en_US&locale=en_US ) in the article it shows that they did indeed hide the option but it can be uncovered. The funny thing is this article does not show up when I search for my problem.
Hold the OPTION key in the Display Preference pane and the Gather Windows button will transform into the Detect Displays button.
Here are screenshots to demonstrate what happens when you toggle the OPTION key off and on.
Again why on earth did they hide this to begin with or not include it in the Display Menu option at the top of the screen? I don't know and I hope they fix it. This is WAY TOO complicated of a solution for a simple function. Nobody is going to intuitively find the Detect Displays option.

Preview in Mountain Lion Doesn't Like Spot Colors

I upgraded to Moutnain Lion and CS6 at the same time, and one thing I've noticed is that Mac's preview doesn't seem to dig on spot colors. Has anyone else noticed this? It seems to be the case with .ai and PDFs. Not a huge deal; when you open the files, the spot colors display properly, but when you view the files within a folder through Finder, click "space" to preview, or view the file as an attachment within Mail, anything with a spot color previews as solid black, which makes the file appear as if something is "off".
My biggest concern with this is if I'm sending a PDF to a client, and they only view it within their Mail app, will it view properly for them? Not knowing the answer, I've taken to converting all of my spot colors to CMYK before I save the proof file, and this way they display properly within Mac's various previews. Just wondering if everyone using Mountain Lion/CS6 are having this issue, or if mine is somehow an isolated case.

I'm having the same problem. When I open the Acrobat Files, the color looks fine. When I look at a PDF with spot colors in Preview Mode, in a Window Column View, or as an email attachment, I see SOME of the spot colors showing up as black, but not all of them. It seems to depend on the particular Spot Color.

Mountain Lion: Mail does not display directory when attaching file

After upgrading to Mountain Lion, when composing a Mail message and attempting to attach a file, the directory window opens and nothing is displayed. Trying to attach via the paper clip button, not drag & drop. The gear spins continuously but nothing is ever displayed (at least not for the 10 minutes I waited). Doesn't seem to matter which directory is chosen, no files are displayed. Anyone seen this problem? Thanks.

An Apple support 'all in one' Mail with various troubleshooting articles:
Mail

OS X Mountain Lion - Apple mail not displaying images

Ever since upgrading to OS X Mountain Lion a few weeks ago, Apple Mail no longer displays images in emails. I have downloaded and installed the latest Java RTE [it was out of date] - that didn't fix it. I have tried to reset my Java preferences to their defaults - that didn't fix it.
Is anyone else experiencing this issue? If so, have you found a solution?
Thanks in advance!

I have exactly the same problem although its not for every email. My email provider is gmail. If I forward an email to someone else, they have no problem viewing the images. Very annoying. Checked with my gmail account and these are not classed as spam.

Font rendering issue / Mountain Lion / non Apple LCD display

Hello
This font rendering issue or problem is probably well know by Apple crew too but nobody has solved it yet. Only poor solution are available such as try to adjust manually font rendering by writin some scripts concerning anti alias levels...they really dont solve the problem.
Could Apple bring us solution to this by developing or updating Mountain Lion?
So what is the problem: font rendering is very poor in Mountain Lion when using non Apple LCD. For example Fujitsu SL27T-1 LED (LCD displa) shows fonts very nice way in Windows but in Mac OS ML does not. Somebody told me that its about software vs. hardware rendering. Dont know about that but could you bring me the solution which is not advising me to buy Apple display (which is five times more expensive than other manufactures displays).
Br
M. Leino

just want to add that overall fonts look blurry and they are not very sharp.

Mountain lion doesn't support Airport extreme. What am I to do?

When I installed Mountain Lion I lost Airport extreme. Looks like this OSx 10.8 doesn't support it. Is there any way to fix it?

AirPort Utility 5.6 for Mac OS X Lion

Mail app in Mountain Lion doesn't check mails anymore

Right next to every mailbox there's the gray circle with the exclamation mark as if the accounts were offline. "Bring all accounts online" doesn't do anything at all, and neither does clicking on the exclamation mark. Quitting and reopening used to work for a while, now that stopped working. A restart of the computer seems to do the job, but I can't restart the machine everytime just to check mails... I tried deleting the preferences but doesn't do anything.
Really annoying, mail worked just fine before this Mountain Lion upgrade. I recently had my routher exchanged, I believe the problem startet when I put the macbook to sleep, turn of the router, and later when I come back and connect to the internet mail goes crazy.
Please anyones has any ideas before I'm going through the trouble of rebuilding the whole strucutre?
Thanks a lot!
MacBook Pro i7, 10.8.2 with supplemental update

Could it be a possibility that this issue is somehow connected to my new router? I believe this problem started with the new router... So maybe there's a port issue or something?
***Edit***
Alright, so the problem seems to have been the router blocking port 993 which is used by the pop accounts. Look like it works fine now, it had to be added as an open port in the router configuration.

Mac OS X 10.8 (Mountain Lion) doesn't see HP1200 Printer over network

Hopefully somebody can shed some light here -- I have an HP LaserJet 1200 on my ethernet LAN. Have never had any problems setting it up to print using earlier versions of Mac OS or ever Windows -- however as fas as Mountain Lion is concerned the printer doesn't exist. I've downloaded and installed the latest drivers from HP, restarted machine, etc to no avail. Can anybody tell me what I need to do to make 10.8 see the printer across the room?

mikehenden wrote:
Yes, XP box will print with no problems. The 'Properties' index was where I got the IP address from. Have looked at the 'ports' tab, have a port number and see that the protocol is 'Raw'. SNMP status is enabled and SNMP devide index is 1. Does this mean anything to you?
Yes it does. XP is using RAW Port 9100 to connect, which is called HP Jetdirect-Socket on OS X. Given that you have already tried creating a printer queue using HP Jetdirect and this did not work, there must be something else that you need to do.
It also sounds odd that the configuration page you printed does not show an IP address set in the printer. Does the Ethernet cable connect directly to the LJ1200, or is there some type of adaptor between the Ethernet and printer?

Mountain lion doesn't boot

i decide to restart my mac, so i did ( i hit restart from apple menu)
it shut down, tryed to boot, but with grey horizontal loading bar, it was loaded about 10% and then it shut down again
i tryed 5 - 10 times. same story
then i start it with disk utility, and it says that disk cant be repaired, save your data format the disk and reinstall your mountain lion.
ok! if the disk broken (i wonder how could it be???) and i must format disk again,
how i supose to save my data? coz i cant get to finder or anything else
how could it happened with 3 month usage

Heh!
Every new mac that i buy, do break faster than previous!!!
(and YES. My old "PowerBook G4 12 dvi" keep works fine too, PPC unbreakable )
But, in that case, I dont have a backup, I was planning to do it at coming weekend. no luck.
Disk utility says "save my data..." but dont say HOW.
The only solution in my mind is Target Disk Mode.
And i tryed...
• I have another iMac (white one latest 2007, running Leopard 10.5.8)
• 2 firewire 800 cables (they work, checked with WD mybook studio)
• I plug new iMac to white iMac via firewire, then i turn on crashed mac and put it in Target Disk Mode by holding T.
• firewire logo bouncing, but it doesn't mounted on white iMac ((
So I just cant Save My Data. Its ≈200 Gb of unique information (my graphic design files)
Apple not presented in my country yet, but we have authorized dealers, hope they wont bump me.
Any solution to mount TDM appreciated.

Mountain Lion Messes up my Display

Ok, so ever since I installed Mountain Lion, things like this are happening. Today, it was just when I did a screen shot via selecting an area. The other day it was when I plugged in an external display via my Thunderbolt Port. I've also noticed that when scrolling in mail or other programs, the area being scrolled jumps around but won't actually scroll correctly. This seems to happen when I bring my computer back from being asleep and then plugging in my external monitor. Apple, please fix this. At this point, I've had several problems with Mountain Lion and I'm telling my family and friends not to upgrade. I guess you get what you pay for on this one.
Since I marked this as a question. Is there something I'm doing wrong with my display prefs?

No firmware changes on my part. I was having other issues with scrolling in Mail.app that cropped up today.
I tried a suggestion that I found here: http://forums.macrumors.com/showthread.php?t=1430454
I went to System Preferences -> Displays and switched the laptop to a different resolution (which brought with it an adventure in seeing through screen gobbledy-gook) and then back to the full resolution capability of the LCD panel.
The mail scrolling issues went away and maybe this step lets someone track down what is going on.
As far as I know...
workaround for gobbledy-gook on laptop display: close and re-open lid
scrolling issue with Mail.app recovers after switching display resolution
Maybe they're related, maybe not.

Mountain lion doesn't start

I istalled Mountain Lion on my macbook pro 2008, the installation goes well, but after it, it never restarts. It stops with the wheel always rotating.
With snow leopard it works perfectly and I tried many text and it doesn't seem that there are some hardware problems.
please, help me

If you have more than one user account, these instructions must be carried out as an administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Step 1
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Enter "BOOT_TIME" (without the quotes) in the search box. Note the timestamps of those log messages, which refer to the times when the system was booted. Now clear the search box and scroll back in the log to the last boot time when you had the problem. Select the messages logged before the boot, while the system was unresponsive or was failing to shut down. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V). Please include the BOOT_TIME message at the end of the log extract.
If there are runs of repeated messages, post only one example of each. Don’t post many repetitions of the same message.
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.
Step 2
Still in Console, look under System Diagnostic Reports for crash or panic logs, and post the entire contents of the most recent one, if any. In the interest of privacy, I suggest you edit out the “Anonymous UUID,” a long string of letters, numbers, and dashes in the header of the report, if present (it may not be.) Please don’t post shutdownStall, spin, or hang logs — they're very long and not helpful.

Mountain Lion doesn't detect displays on startup

Similar Messages

Maybe you are looking for