IMessage and USB problems with MacBook Pro (Maverick)?
Since I updated my MacBook Pro (2011) to Maverick I have had problems with imessage not working. I also can't use my USB ports for my printer, card reader or external disk. USB ports work together with my iPad and iPhone. Does anybody out there have an idea about what I can do to fix these things? Many thanks in advance.
Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your personal files or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you boot, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, reboot as usual (not in safe mode) and verify that you still have the problem. Post the results of steps 1 and 2.
Similar Messages
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Power and battery problems with MacBook Pro intel core duo
Hi there, I've been having this problem for about a week now with my macbook pro where it shuts down a second after it's unplugged, even though the battery is full. I tested the power cord with another that works, and the same thing still happens. I've zapped the p-ram, and reset the MPU where you take out the battery and hold down the power button for 5 seconds and all that. I think it might be the logic board, or something within that? Any suggestions before I send it in to Apple for investigations?
I started having the same problem several days ago. Unplug the magsafe connector, and the MBP powers suddenly powers off, even though the battery shows a full charge on both the menu bar and the battery leds.
I decided to try a new battery after reading a number of posts here about the same problem.
Back to normal with the new battery. So now I'll go back to Apple to get the non-functioning battery replaced under AppleCare. (I wanted a second battery anyways)
Hope this helps. -
I have a Time Capsule version 7.7.3 (model A1470) which has worked fine for almost 2 years with all devices, Apple and otherwise. As of beginning of this month, March 2015 - no longer works with a new IPAD mini 3 and 6-month old iPhone 6 (both updated as of last night) BUT still works fine with MacBook Pro (Mavericks 10.9.5) and Epson printer XP-600.
On both IOS devices Airport Utility shows the Time Capsule and shows green light connection to internet, but never does the connection. The little status circle just keeps going round and never shows the Wifi rainbow symbol. both devices work fine on other Wifi's. Airport Utility on iPhone actually connects enough to check on Airport base station's firmware 7.7.3 and says it is up to date! but sadly stays on LTE.
Have tried resetting, replugging etc...
Also, tried checking on updates. Nothing shows in Airport Utility. When I try to go to see past updates ~/Library/Application Support/Apple/AirPort/Firmware to see if updated, there is no Airport in the Apple folder?
A mystery...Reset the TC to factory and redo the setup. see details below.
Here is the typical list of things you should try.. and if this doesn't help post again.
Factory reset universal
Power off the TC.. ie pull the power cord or power off at the wall.. wait 10sec.. hold in the reset button.. be gentle.. power on again still holding in reset.. and keep holding it in for another 10sec. You may need some help as it is hard to both hold in reset and apply power. It will show success by rapidly blinking the front led. Release the reset.. and wait a couple of min for the TC to reset and come back with factory settings. If the front LED doesn’t blink rapidly you missed it and simply try again. The reset is fairly fragile in these.. press it so you feel it just click and no more.. I have seen people bend the lever or even break it. I use a toothpick as tool.
N.B. None of your files on the hard disk of the TC are deleted.. this simply clears out the router settings of the TC.
Setup the TC again.
ie Start from a factory reset. No files are lost on the hard disk doing this.
Then redo the setup from the computer or perhaps it is better using iOS on the phone or ipad currently having issues.
1. Use very short names.. NOT APPLE RECOMMENDED names. No spaces and pure alphanumerics.
eg TCgen5 and TCwifi for basestation and wireless respectively.
Even better if the issue is more wireless use TC24ghz and TC5ghz with fixed channels as this also seems to help stop the nonsense. But this can be tried in the second round. For iOS the fixed channels particularly for 2.4ghz has helped.
2. Use all passwords that also comply but can be a bit longer. ie 8-20 characters mixed case and numbers.. no non-alphanumerics.
3. Ensure the TC always takes the same IP address.. you will need to do this on the main router using dhcp reservation.. or a bit more complex setup using static IP in the TC. But this is important.. having IP drift all over the place makes for poor networking. If the TC is main router it will not be an issue. This is a problem for a TC in bridge mode.
If this is of no help.. what modem do you have? What function other than modem does it have.. ie none or router??
How is the TC connected into the network? What function does it have? Router or bridge for example.
Post a few screenshots of the setup. -
I have a problem with macbook pro OS 10.5.8 and cannot play youtube anymore, before Yes
i have a problem with macbook pro mac os 10.5.8 and cannot play youtube but before ther is no problem abou this. now there is warning sign to install adobe flash player, but when i install adobe it said cannot be compatible, and I went to the apple store, they sid need to upgrade the system to mac IOS 10.6 and i dont want to spend much... somebody to help me this
Upgrading to Snow Leopard
You can purchase Snow Leopard through the Apple Store: Mac OS X 10.6 Snow Leopard - Apple Store (U.S.). The price is $19.99 plus tax. You will be sent physical media by mail after placing your order.
After you install Snow Leopard you will have to download and install the Mac OS X 10.6.8 Update Combo v1.1 to update Snow Leopard to 10.6.8 and give you access to the App Store. Access to the App Store enables you to download Mavericks if your computer meets the requirements.
Snow Leopard General Requirements
1. Mac computer with an Intel processor
2. 1GB of memory
3. 5GB of available disk space
4. DVD drive for installation
5. Some features require a compatible Internet service provider;
fees may apply.
6. Some features require Apple’s iCloud services; fees and
terms apply.
Upgrading from Snow Leopard to Lion or Mavericks
To upgrade to Mavericks you must have Snow Leopard 10.6.8, Lion, or Mountain Lion installed. Purchase and download Mavericks (Free) from the App Store. Sign in using your Apple ID. The file is quite large, over 5 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
OS X Mavericks- System Requirements
Macs that can be upgraded to OS X Mavericks
1. iMac (Mid 2007 or newer) — Model Identifier 7,1 or later
2. MacBook (Late 2008 Aluminum, or Early 2009 or newer) —
Model Identifier 5,1 or later
3. MacBook Pro (Mid/Late 2007 or newer) — Model Identifier 3,1 or later
4. MacBook Air (Late 2008 or newer) — Model Identifier 2,1 or later
5. Mac mini (Early 2009 or newer) — Model Identifier 3,1 or later
6. Mac Pro (Early 2008 or newer) — Model Identifier 3,1 or later
7. Xserve (Early 2009) — Model Identifier 3,1 or later
To find the model identifier open System Profiler in the Utilities folder. It's displayed in the panel on the right.
Are my applications compatible?
See App Compatibility Table — RoaringApps.
Upgrading to Lion
If your computer does not meet the requirements to install Mavericks, it may still meet the requirements to install Lion.
You can purchase Lion at the Online Apple Store. The cost is $19.99 (as it was before) plus tax. It's a download. You will get an email containing a redemption code that you then use at the Mac App Store to download Lion. Save a copy of that installer to your Downloads folder because the installer deletes itself at the end of the installation.
Lion System Requirements
1. Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7,
or Xeon processor
2. 2GB of memory
3. OS X v10.6.6 or later (v10.6.8 recommended)
4. 7GB of available space
5. Some features require an Apple ID; terms apply.
This, Adobe Flash Player 12.0.0.70, is the current version of Flash. It should work with Snow Leopard or later. -
Using Thinkpad Trackpoint USB Keyboard with MacBook Pro, Air, Retina (with pictures)
Using Thinkpad Trackpoint USB Keyboard with MacBook Pro, Air, Retina (with pictures)
The purpose of this discussion thread is to:
(1) Get community thoughts around using alternative and complimentary mousing approaches with MacBooks
(2) To share a current and searchable set of resources for those interested in leveraging a best-of-both-worlds approach for using a non-Apple Trackpoint Keyboard with an Apple MacBook.
(3) To level-set the fact that a Thinkpad Trackpoint USB Keyboard works with MacBooks automatically and instantly out-of-the-box.
Note: I created this discussion because I found that all the other discussion threads related to using a Thinkpad Trackpoint Keyboard with MacBooks were archived and therefore I could not post my thoughts there.
I have been using MacBooks for 3+ years now. Airs, Pros, Retinas etc. I LOVE the built-in MacBook Apple Trackpad. It is wonderful. Apple has no equal as far as Trackpads go.
In addition, I have been using the Thinkpad Trackpoint USB Keyboard with my MacBooks for ~2 years, and below is why I have found BOTH the Apple Trackpad and Thinkpad Trackpoint to be great.
The Trackpoint and Trackpad both have their sweet spots. Personally I use the built-in Apple Trackpad on my MacBooks when I'm using my MacBook for less than 1 hour, loosely speaking. If I am going to be heads-down for more than 1 hr writing, reading, surfing, graphic designing, programming, workshop facilitating, teaching, mindmapping, presenting, demoing, etc. then I pull out my "Lenovo Thinkpad USB Keyboard with Trackpoint (55Y9003) > https://www.google.com/search?&q=lenovo+thinkpad+trackpoint+usb+keyboard
I know many will laugh at me for using a Thinkpad Trackpoint Keyboard with a MacBook... Keeping an open mind, let's just agree that there is historical precedence for alternative mousing devices. If I could only choose one, I would use the Apple MacBook built-in Trackpad exclusively, however with alternatives come potential benefits. Keep in mind that Apple, Microsoft, Logitech and many other companies make millions of dollars each year providing alternative peripheral devices for computers, and mousing is no exception. Regardless, I just want to share my positive experiences using both. :-)
Why should you care? For *some* people the following is true and meaningful. The Trackpoint (the little red eraser head stick thingy) in the midle of the keyboard enables useful and unique dynamics/use-cases, including:
You don't have to take your hand(s) off the keyboard to mouse
You can independantly click without accidentally moving the mouse (Yes I know some people don't have issues with this)
You don't run out of finger-gesture runway when you're moving your mouse across the screen (I know this is a gray area for some people)
For mouse-movement-heavy applications (e.g. Graphics, drawing, etc.) the Trackpoint *is at times* more exacting
Below I share some pictures (which I know *look* ridiculous to some people, but none-the-less help demystify what this looks like. And, while ridiculous looking, it is actually quite thin and elegant once you get over the initial shock of seeing these two diverse technologies combined in this way.
Rest assured, the keyboard shown below (google "55Y9003") is VERY light, thin and fits in almost any laptop case/backpack easily so it is not a big deal to carry it, if you work on-the-go. In addition:
It is UNCANNY how well it fits on top of the keyboard space of all MacBooks.
It fits perfectly around the corners of the MacBook Pro/Air/Retina keyboard
Note: I took one of the 5 rubber feet/pads off the bottom of my keyboard, the one in the middle
Lastly, you can actually use the built-in Apple Trackpad at the SAME TIME as the Trackpoint Keyboard.
It is quite a nice best-of-both-worlds approach for people that like the benefits of the "Why should you care?" use cases above.
Please reply and comment with your thoughts and please let's keep it positive, constructive and friendly :-)
Pictures Below:
My two Retina MBPs, one with and one without the keyboard, so you can easily see the difference. (As if you wouldn't)
A slightly closer-up shot of just the RMBP with the Trackpoint Keyboard on top
Please reply and comment with your thoughts and please let's keep it positive, constructive and friendly :-)Newer Bluetooth version of the ThinkPad External Trackpoint Keyboard available...
The new version is smaller, so you can use your MacBook Trackpad at the same time as your Trackpoint keyboard.
Here is the Lenovo model/Part Number# 0B47190
Here is a picture of what it looks like:
Note: Just like the older larger USB model keyboard, there is a rubbery footpad in the middle of the bottom of the keyboard that I just peeled off. Otherwise, it makes the "H" key press accidentally under-neath the keyboard. Once I took that off, it fit perfectly over and around the built-in MacBook keyboard, so I can optionally put it on top of my MacBook for easy typing. :-) -
Having problem with MacBook Pro launching mission control without prompting
Having problem with MacBook Pro, launching mission control without prompting. Please advise. Thank you.
It may be a swipe that's doing this > Mac Basics: Mission Control
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Outlook 2011 slow, clunky and keeps crashing with macbook pro os 10.8.4 - any hints?? ta :)
Outlook 2011 slow, clunky and keeps crashing with macbook pro os x 10.8.4 - any hints?? ta
You might look in your User Library for Outlook .plist(s). They probably start with com.microsoft.
Quit Outlook.
Either hold down the option key while using the Finder “Go To Folder” command and select your user Library in your home folder or use the Finder “Go To Folder” command and enter ~/Library/Preferences. Move the .plist(s) to your desktop.
Open the application and test. If it works okay, delete the plist(s) from the desktop.
If the application is the same, return the .plist(s) to where you got them from, overwriting the newer ones.
If you prefer to make your user library permanently visible, use the Terminal command found below.
Show User Library
You might want to bookmark the command. I had to use it again after I installed 10.8.4. I have also been informed that if you drag the user library to Finder it will remain visible. -
I have Mac OS X Version 10.6.8 ,I want to buy the updated operating system that puts iMessage and Facetime on my Macbook Pro. What should I search for, and then purchase, in the App Store?
FaceTime can run in the version of OS X that you currently have. To get Messageyou need Mountain Lion. The protocol used by Messages is iMeassage.
The question is does your MBP meet the specs for Mountain Lion.
iMac (Mid 2007 or newer)
MacBook (Late 2008 Aluminum, or Early 2009 or newer)
MacBook Pro (Mid/Late 2007 or newer)
MacBook Air (Late 2008 or newer)
Mac mini (Early 2009 or newer)
Mac Pro (Early 2008 or newer)
Xserve (Early 2009)
Your Mac needs:
OS X v10.6.8 or OS X Lion already installed
2 GB or more of memory
8 GB or more of available space -
I have an USB problem with Logitech Cordless Wingman Gamepad. I have dowloaded the newest version of logitech gamepad, and the VIA drivers for motherboard K7T266-pro. I also tried to install the USB filter rc1, but the problem remains.
Here is how the problem occur:
1. On start up, the gamepad is detected and ready to use.
2. While I am playing a game, the usb device is reconnecting a lot. I turned of the "Allow this device to turn off to save power" in device manager under all USB root hub. But the problem remains.
3. After a while, when I have been playing for a while, the gamepad turns off, and the usb device is not recognized error message appears. Under device manager I now have a Unknown Device under USB.
4. To get it function again I have to restart the computer.
Anybody who knows the answer for this ?I have a similar problem but with my Logitech optical mouse. It's also using the usb port and it keeps disconnecting and reconnecting the device in Win XP. I use to have Win2000 and I experienced the problem but not as often as now. Also in Win2000 there wasn't an annoying sound when a device would connect and reconnect, and not to mention when your playing a game and the mouse quits for 1/2 a second, really annoying! Sometimes it will quit completely and I have to either physically reconnect it or reboot to get it working again.
I have recently tried fixing the problem:
a) I flashed my old Bios and put in ver 1.9 from this site
b) I've updated the Via 4in1 drivers
c) I've updated the mouse drivers that come from Logitech.
None of these updates helped. I've taken my mouse to work to see if it does the same thing, but so far so good. My pc at work is running Win2000 but different MB. I don't think there is anything wrong with the mouse. Although I haven't tried using the PS/2 adapter that came with it and see if it behaves the same way. I have a feeling the mouse will work fine, but kinda sucks cause I have usb and I have to revert back to PS/2 just so it works properly.
I've read on the Via Hardware forum some people having the same problem but with an Abit board. They changed something in their Bios to resolve it. If anyone has any ideas, maybe changing something in the Bios that has to do with the usb ports, I would greatly appreciate it. -
PROBLEM WITH MACBOOK PRO 2.4 Dual Core and MOTU Ultralite
Hello,
I Recently bought a macbook pro to have for my Live appearance.
I also had a motu Ultralite which worked super well with my Pc and with the macbook the first days
One day i had to play live in a club so i connect my soundcard but the macbook wont recognize it coz i cant see the popup window that i get everytime i connect my motu on it...i rebooted the soundcard then the laptop nothing...i started sweating coz my live performance would start in 20 minutes noting came out of it so i cancelled the gig for the moment and played a Dj set instead.
When i got home i connected the card again and was working perfectly till yesterday..So i thought there was something wrong with the Power in the Venue or something like that.
Yesterday i connected the soundcard and again does the same any other firewire device was working properly.
I searched online and saw there is alot of people having the same issue but no solution.can someone tell WHY sometimes it works and sometimes doesnt??its very stupid to have 2 machines with a cost of 2500 euro almost and they dont work well together
Op system: Leopard 10.5.7
Motu ultralite Mk2 firmware: 1.15
motu ultralite driver 1.4.21
Thank you in advancePopping in to say that I have now a fully functional Ultralite (mk3) under OS X 10.5.8 on my Macbook.
I have found that people who have upgraded the firmware to 1.15 were having problems (according to the MOTU site this upgrade isn't actually meant for the mk3 anyways) with Leopard (maybe Snow Leopard too?) and needed the 1.00 version of the firmware.
Using the drivers supplied on the MOTU CD, the device would not appear when connected to the Macbook. However, removing these from the system prior to downloading the latest MOTU Universal driver from their website seems to have solved it.
Now after installing the universal drivers from the website the device works without any problems (driver 1.4.23 of MOTU Audio Setup). Hope this helps someone -
Problem with Macbook Pro 2,66Ghz and 4GB Kingston memory
Hi all,
I bought 2x 2GB Kingston memory(SODIMM - DDR2 @ 667MHz) in order to upgrade my MBP.
When I install both modules, the MBP won;t boot. I get a blank screen.
If I use 1 Kingston module at a time (1x1GB(original memory module)and 2GB(Kingston)) .It works fine.
Both of the Kinston RAM modules seem to be working fine, when not installed together, but MBP doesn;t start when both are installed at the same time.
Any idea of what the problem could be?
Is related to my MBP or it has to do with the Kingston Modules?
Thanks in advance.D. P. Bailey wrote:
Hi, I'm having the same problem on the 2.4 (early 2008 2.4 GHz macbook pro.) I bought 2x 2gb Crucial RAM and installed correctly, but the machine doesn't start up. So, I tried every conceivable combination, but the new 2gb RAM only works when paired with one of the old 1gb sticks giving me 3 gb total.
The new 2gb sticks BOTH work (when paired with old RAM), just not together. The 2gb RAM they sold me shows its speed as 6400 800mHz -- Could the faster speed be the problem? My system profiler shows the 800mHz RAM as 667mHz when it is installed.
D.P. it looks like you have the same mbp as me. I talked to Apple Support on the phone a couple weeks ago doing my own research and learned (i'm not SUPER tech-savvy) that the laptop is 800mhz but will only accept ram of 667mhz because the computer has to be faster than the memory installed in it. They cannot be the same speeds. Don't know if this would cause the problem you are having, though. -
Hi Guys
I recently bought a second hand early 2011 Macbook Pro 15 inch and are having 2 problems. The first is that none of the apps detects my webcam at all, the second is, i have Windows 8 installed on bootcamp but are unable to get the keyboard backlight to work in 7 or 8. The backlight works perfect in os x 10.8.5 though. I need a little bit of help guys.....Go to Apple Menu / About This Mac. Click on More Info ... next on System Report. In the left hand column, under Hardware, select USB. The right side will show the USB Device Tree. Look through that and check for "Built-in iSight". That is your camera. If it is not listed the camera is not working.
For backlighting, try this: go to System Preferences / Keyboard. Uncheck "Adjust keyboard lighting in low light". -
Problem with Macbook pro and Airport Express!!!
I'm having the same problem I have seen others with right now with my macbook pro and my airport express. I have set up and reconfigured the A.Express 3 times now. I have the green light, i have the Ethernet configured, I have full bars of reception but I cannot access the signal. meaning I can not go online even though everything is set up correctly and says that it's good to go. Anybody have any advice?
Is it an issue with having to re access the network I created with the Airport utility?
It worked the first time I configured the A. Express with my macbook pro no problem. Then suddenly my computer was just not getting internet. Even though all the settings were ok and I was even getting full bars reception from the device on my comp. So I reset the A.Express and have been having the problem mentioned above since that point. Please help me if you have any advice. Thanks so much in advance.I had the same problem, and to test if I was connected launched Safari and Safari after a few seconds of not connecting, it shows you a dialog box, with options to follow up, I follow the dialog box and like magic I am connected to the Internet.
-
On a recent holiday abroad my Huawei dongle on contract with Orange with roaming abroad enabled would not work with any mobile network operators in either Portugal or Spain. My local Orange dealer advises he has had this complaint before with other Macbook users. Is this a known problem and if so how can I overcome it?
Thank you,
StoneybrokeThank you for your reply ds store.
Orange has a large portion of the European market and I was actually connected to 3G Orange Spain on my roaming IPhone when in Spain, at the time my dongle would not work. Not only that, I checked with Orange UK before my holiday and they not only confirmed the two countries I was travelling to were ok as deals were in place, but also took my money for an additional roaming data bundle, but still no luck.
Twice when in Portugal on separate days of trying I actually connected to their local mobile network provider and managed to download my emails before being disconnected after about one minute. This only occurred when I had re-booted my Mac.
As soon as I returned to England last week the dongle worked perfectly so it does point to the European local mobile provider and how my MacBook Pro talk to one another. To validate this point, last year I used the exact same dongle and sim with a windows PC I had at that time and all worked perfectly well.
I have found similar problems within this forum but no actual solutions that I can find anyway. I just wish I could find a definitive answer to guarantee the combo works next time I am in Europe.
Regards,
stoneybroke -
Weird problem with Macbook Pro 15" and Asus PB278 monitor
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.Hi Gatobolo,
Thank you for contributing to the Apple Support Communities.
It appears that you've discovered unusual behavior with your MacBook Pro and an external display, where you need to temporarily connect a different display adapter before you can use your Asus PB278 again.
I can offer some additional tips to help resolve or further isolate the issue you're seeing.
First, try the following resets to see if they eliminate the behavior:
You can reset the Mac's parameter RAM and SMC.
Next, if the issue occurs again, try restarting your Mac into Safe Mode:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
Choose Displays from the View menu to open the preferences pane.
Select any resolution and refresh rate that your display supports.
Restart your computer.
You can find the steps above in this article:
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
If your display is recognized in Safe Mode, or after restarting again, the issue may be due to a software conflict.
Another suggestion mentioned in the article above is to try a different type of display adapter, such as a Mini DisplayPort to Dual Link DVI adapter.
If the issue persists, you can also back up your data, erase your hard drive, and reinstall a fresh copy of OS X Yosemite.
OS X Yosemite: Erase and reinstall OS X
If the issue still occurs after a clean install, troubleshooting the hardware may be necessary.
Best Regards,
Jeremy
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