My screen looks bleached after installing Yosemite?

The image is very bright And hard to read totally washed out. Looks like the HDMI cable is not fixed correctly but it is. Re calibrating the monitor (Phillips 227E4LHAB) has absolutely no effect. A brand new monitor so cannot afford to change it and why should I.

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My second screen disconnects randomly after installing Yosemite. ¿Any suggestion?

My second screen disconnects randomly after installing Yosemite. ¿Any suggestion?

Hello Juanjeli,
Thanks for the question. Based on what you stated, it seems like you are having trouble using an external display. I would recommend that you read this article, it may be able to help you resolve or isolate the issue.
Apple computers: Troubleshooting issues with video on internal or external displays
Thanks for using Apple Support Communities.
Cheers,
Mario

I have a white screen at startup after installing Yosemite. Help!

imac 2011 goes to white screen and black cursor during startup

Hello Hackdog1,
It sounds like you are unable to boot your Mac after updating to Yosemite I would recommend you use the troubleshooting in the following article to help resolve the issue:
Mac OS X: Gray screen appears during startup
Start with these steps, and work your way down the rest of the article if needed:
Disconnect, test peripheral devices and network cables
Note: "Peripheral devices" refers to external devices other than what came with your Mac, such as hard drives, printers, or hubs that you connect via a USB or FireWire cable.
Shut down your Mac. If necessary, hold your Mac's power button for several seconds to force it to power down.
Disconnect all peripheral devices such as external hard drives or printers (leave only the display, a keyboard, and mouse connected).
Disconnect any Ethernet cables.
Start up your Mac.
If you can start up this way, one or more of your peripheral devices (or installed software related to the device) is probably causing the gray screen issue. Connect one device, then restart your Mac to test for the issue. Repeat the process until you locate the device at issue. Make sure the device is powered if it needs to be to operate correctly. Check with the manufacturer of the device for support or possible software driver or firmware updates that may be available for the device. Try a different cable with the device if possible (such as a different USB or FireWire cable).
Note: If you have multiple peripheral devices and the issue only occurs when they are all connected, but not when each device is the only peripheral connected, see the Additional Information section below.
If you are using a desktop Mac with a third-party keyboard and/or mouse device, and the issue still occurs, try starting up with an Apple keyboard and mouse connected instead. Try starting with no keyboard and mouse connected, then connect them after start up. Also, try a different USB port on your Mac.
If the gray screen issue persists with no devices connected, go to the next section (with the peripherals still disconnected).
Thank you for using Apple Support Communities.
All the very best,
Sterling

Occasionally flickering iMac screen after installing Yosemite

Occasionally flickering iMac ()intel) screen after installing Yosemite. Cannot yet specify when the flickering occurs, but it cover large sections of the screen. Absolutely annoying.

I also have this issue but only below 6 screen illumination steps (bars)
This flickering issue is active after waking up from sleep os screen sleep and if I increase the screen light to a setting higher than 6 screen step for a wile (30 seconds or so) and the reduce the light to a level below 6 steps it usually holds on without flickering.
This happens on an late 2009 iMac with nvidia card running OS X 10.10 and apple later upgrades but not (until now) on another same age and OS X version iMac I have but instead of the nvidia card it has an ATI
Question:
Has anyone tried to use the Mavericks nvidia graphic card driver with Yosemite?

Impossible to install Creative Cloud after install Yosemite for Mac

Impossible to install Creative Cloud after install Yosemite for Mac

Error 62 https://forums.adobe.com/thread/1573853
or
A chat session where an agent may remotely look inside your computer may help
Creative Cloud chat support (all Creative Cloud customer service issues)
http://helpx.adobe.com/x-productkb/global/service-ccm.html

After install yosemite : one resolution and bad rotation external display

0- macbook pro 2008 external screen HP L1750 (under a hp factory rotary arm support) on minidisplay to vga
( this monitor works 60 and 75 htz (natively)
1 - hello, after installing yosemite my external monitor L1750 is only resolution 1280 * 1024.
Before, you have to know that every thing works properly throuth leopard and lion.
and with rotation
Well ! Under yosemite with out harware changed (just reboot and changed firmware): i have that :
2 - only 12080*1024 resolution posssibility
and when I rotate : i lost full screen with a twice black stripes.
2,1 when i pull down'al' keyt on scale into pref monitor? i have this :
but the rotate option send the same bad result to my external screen L1750 !!
3 - i try with the option monitor vga and it work properly at 800 * 600. But, i don't know how to repeat or call this option again ,
because is just appear like that for just a moment !!
4 - Hp assistance factory have no solution !
i espect solution :
A - input the good resolution to the choice monitor HP L1750 for landscape and portrait to !!
( perhaps the same file used on leopard or lion OS) but where find and put it ?
-a script to force resolution on the file already here, ...)
or
B - call choice vga monitor into pref monitor and some good resolution include on rotate option
Thanks , a lot to read me and enjoy to answerd me usufull.
have a good day

Any Idea? please I work outside many times with my computer and work like that is a bull....t
I need Help !

No internet connection after installing yosemite

After installing Yosemite, I have no internet connection. If I hold option key, my wifi description shows Internet as unreachable,although all my bars are dark and the rest of the settings look the same. When I connected via cable, it did not show an Ethernet connection. My pc and iPad work fine,so it isn't my carrier. Anyone else have this problem and know a fix??? Thanks so much for any assistance..

You are on to something here.
I tried unloading, and it was not found. I then loaded the file, and magically all my apple apps made their network connections and started working.
But here's where it gets funny.
I logged off, and into another use account and I had no network connection.
I logged back into my account, and had no network connection. I needed to unload and load the file again for the network to return.
More troubleshooting ahead...

Great Problemes after installing Yosemite (10.10.2 ) with Photoshop CS6....The program crashes --last time 10 times during my work session..wacomtable doesnt work..it is slow...and get error messages about the graphic card....It s a Terror to work with my

great Problemes after installing Yosemite (10.10.2 ) with Photoshop CS6....The program crashes --last time 10 times during my work session..wacomtable doesnt work..it is slow...and get error messages about the graphic card....It s a Terror to work with my beloved Photoshop!

The Yosemite upgrade very often damages existing Photoshop installations. Thank Apple for that.
You need to uninstall and re-install Photoshop, then apply all the Photoshop upgrades from scratch.
But first, give us details about your setup:
BOILERPLATE TEXT:
Note that this is boilerplate text.
If you give complete and detailed information about your setup and the issue at hand,
such as your platform (Mac or Win),
exact versions of your OS, of Photoshop (not just "CS6", but something like CS6v.13.0.6) and of Bridge,
your settings in Photoshop > Preference > Performance
the type of file you were working on,
machine specs, such as total installed RAM, scratch file HDs, total available HD space, video card specs, including total VRAM installed,
what troubleshooting steps you have taken so far,
what error message(s) you receive,
if having issues opening raw files also the exact camera make and model that generated them,
if you're having printing issues, indicate the exact make and model of your printer, paper size, image dimensions in pixels (so many pixels wide by so many pixels high). if going through a RIP, specify that too.
A screen shot of your settings or of the image could be very helpful too,
etc.,
someone may be able to help you (not necessarily this poster, who is not a Windows user).
Please read this FAQ for advice on how to ask your questions correctly for quicker and better answers:
http://forums.adobe.com/thread/419981?tstart=0
Thanks!

Wifi keeps dropping out on MacBook Pro after installing Yosemite

Wifi keeps dropping out on MacBook Pro after installing Yosemite. This is not good. Apparently, a lot of people are having this issue with Yosemite. Any suggestions for my MacBook Pro? It's bad enough that Yosemite looks so boring, but to have a major issue like constantly disconnecting from wifi is deplorable.
I plan to keep Mavericks on my iMac until this issue is resolved.

Wi-Fi: How to troubleshoot Wi-Fi connectivity
Wi-Fi Problems in OS X Yosemite
Wireless Diagnostics
Also try turning off Bluetooth.

Can't load photoshop after installing yosemite

Having trouble loading PS5.5 after installing Yosemite - getting error message 'An unexpeced and unrecoverable problem has occurred, photoshop will now exit'.

FOUND MY FIX. I did the 8.25 update for Java...no luck. So I dug a little more. Looks like it was trying to send me to a support.apple link that was dead, so I went digging for where it was trying to point me.
Java for OS X 2014-001
FIXED!

Mac stuck restarting after installing Yosemite

My 2011 MBP has been stuck "restarting" for about an hour now after installing Yosemite. The striped loading bar is grey and stationary but the charcoal circle is spinning underneath. Any suggestions? Do I leave it run overnight and call support in the morning? Thankfully this happened after Midterms, but I'm afraid I'll lose everything if I turn it off. (I decided to upgrade on a whim...I know...and the last backup is from the beginning of the summer. :/ )

Same thing happened to me - except, of course, that I made a back-up before installing Yosemite. I could not get my machine to boot - it would get stuck exactly the same way as yours. I tried for hours - and nothing...
I finally wiped my HD and used time machine to install my latest back-up. Without such a back-up, I don't know what options you have. Your best bet is probably this:
Gray, Blue or White screen at boot, w/spinner/progress bar

Pictures disappeared after installing Yosemite and new Iphoto. Why

Pictures disappeared after installing Yosemite and new Iphoto. Why ?

I also started having problems with iPhoto after installing Yosemite. Some of the Event collections lost the picture and just has a grey square in its place. When I click on the Event, it shows a white dotted lined square for each picture and if I click on the picture, it shows an exclamation mark.
Check, if you also are having a folder "Old Masters" inside the iPhoto Library package, as described by Muhamad Abdulkadir.
Ctrl-click (or right-click) your iPhoto Library in the Pictures folder , then select "Show Package Contents". If you are seeing a folder "Old Masters", copy this folder out of the library. Look inside - are the original image files of the problematic photos inside?
Are any photos in your "Masters"folder?

After installing Yosemite, cannot login after wake from sleep mode

After upgrading to Yosemite this morning, I've had the problem that after the computer goes into sleep mode, I cannot log back in to use the computer because I can't enter my user password. The screen looks fine after I press a key on the keyboard or move the mouse (I see the users and where I would type my password), but mouse clicks do not allow me to activate the password box (however, I do see the mouse pointer and can move it), and any buttons pressed on the keyboard have no effect. If I shut the computer down, I can login without problem. Any thoughts on how to resolve this? I'd hate to have to turn the computer off every time I step away for 10 minutes...

Hi ..
See: "If your machine only boots into Safe Mode (Shift key) any of these may be the cause" > ..Step by Step to fix your Mac | Apple Support Communities

Macbook Air Late 2010 display flickers after installing Yosemite

Hi !
I'm from Germany.
i have upgraded my Macbook Air, Late 2010 from Mountain Lion to Yosemite last Saturday.
The Installation works fine. At the first Time i have no problems, but:
One Day later i start my Macbook Air normally. Now the left side of the screen is flickering.
There are vertical lines to see. The right side of the integrated screen is ok.
i have resetted the SMC and the Power Management.
Please help, what can i do ?
Greetings
iRoGo

I noticed a similar issue with my MBA 2012 after installing Yosemite. The screen flickers slightly most of the time now. It's more noticeable with dark backgrounds. It almost 'vibrates' and is very annoying. Reminds me of an old monitor with a low refresh rate. I reset the SMC, PRAM, etc. and contacted Apple, who had me go through the same steps. The flickering is still present when booted into Recovery Mode. When I boot into Safe Mode the issue gets dramatically worse and I see screen artifacts like iRoGo describes -- parts of the screen blanking out, whole screen/parts of the screen flickering on and off, lines appearing, etc. It's basically unusable in Safe Mode.
At this point the issue seems to be hardware-related (i.e. issue persists in even in Recovery Mode), but I'm suspicious seeing that it manifested right after installing Yosemite. I will be bringing my MBA to Apple for service later this week...

Reboot Stuck After Installing Yosemite

After installing Yosemite I got a notification that the system would be slow while it optimizes the system. Well, after 3 hours of using it in slow motion, I rebooted. During the shutdown phase I got a blank screen with a spinning wagon wheel. It's been like this now for about an hour.
Any suggestions?

Usually, if your drive does not appear at all in Disk Utility, then it has died. What is the exact model Mac that you have? If it is pre-2011 then it cannot do full Internet Recovery. I don't know what the error message means. Are you using a default router setup or are you using your own configuration with different DNS settings? I don't know what that error means, specifically, but usually those errors indicate a connection problem. If possible try using Ethernet rather than Wi-Fi.

My screen looks bleached after installing Yosemite?

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