IMac starts not correctly after update to Yosemite

Seit meinem Update auf OS X Yosemite Version 10.10.2 startet mein Rechner nach einigen Tagen nicht mehr richtig. Es erscheint meist ein grauer Hintergrund. Stromlos machen und Start mit Wahltaste und Auswahl der Festplatte hilft erst nach mehreren Neustarts. Eventuell habe ich ein Update OS oder Safari oder Java in Verdacht für den Ärger.
Wer hat mir bitte eine Lösung?
Danke
Helmut

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Netflix Streaming on MacMini does not work after update to Yosemite

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All of the monitor specs. would indicate that streaming videos in HDCP would be possible. Everything streamed very well until approximately 4 days ago.
I have changed the display resolution to 1080p. I have disconnected the monitor and reconnected it several times. I have updated iTunes as well as Yosemite.

Have you went to NetFlix's support site?

My iMac does not boot after update!!!

I have just update my iMac (Intel) with Apple Software update. I have not updated for quite a while and obvious there were a bunch of stuff to update on my mac. However, when the computer requests a restart, my computer simply does not restart at all. I have tried to make it restart from the apple icon, and it still stay on. So I turn it off manually and the problem kicks in. My computer start with the grey apple icon screen and the little progress indicator, but it does not boot into OS X!!! It remains in a blue screen with the mouse pointer.
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Interesting. Have you installed any third-party RAM? Is there any possibility that your RAM became loose? Make sure your existing RAM is seated properly.
Have you performed a SMC reset?
Resetting the SMC can resolve some computer issues such as not starting up:
From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).
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ITunes 12.0.1 not working after updating to Yosemite OS X

After updating my Mac to Yosemite OS X, iTunes app simply doesn't open.
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IPhoto not "installing" after updating to Yosemite

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Here's the deal....First I backed up my iPhoto Library; downloaded the iPhoto Updater 4 times; each try it popped up on my desktop within seconds and
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Good luck and good night.

Mail thread in Apple mail not working after updating to Yosemite

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The longest thread about this seems to be this one: LINK
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My imac will not restart after updating itunes. What do I do?

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See if you can get back in with a Safe Boot. Shutdown (hold power button in until it does, if necessary), hold down Shift at the startup chime and give it much longer to boot. Might try repairing Permissions while in Safe Boot, from Disk Utility. Also Verify Disk. No need, as Safe Boot should do this.
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Hi.
I updated my Mac to OSX Yosemite. My printer stopped working. Where can I find the right printer driver?

Hello @Paul_en_Mar , and welcome to the HP Forums.
I am sorry, but to get your issue more exposure I would suggest posting it in the commercial forums since this is a commercial product. You can do this at HP Commercial LaserJet Forums.
I hope this helps!
Please click “Accept as Solution " if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks" for helping!
Jamieson
I work on behalf of HP
"Remember, I'm pulling for you, we're all in this together!" - Red Green.

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Hello.
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Best regards,
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This thread may give you some help:
RAW files suddenly show up as "not supported" (Aperture 3.5.1, OS X 10.10)

Adobe Indesign not working after update to Yosemite?

Can anyone help with this issue?

Google can be your friend:
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How to Do a Clean Install of OS X Yosemite - Mashable

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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.”
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Test while in safe mode. iTunes doesn't work in safe mode, but it should launch. Same problem?
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I cannot run iPhoto after update to Yosemite. I cannot update iPhoto because the application store does not have any iPhoto update available. Anyone can advice how to overcome this hassle?

After update to Yosemite 10.10.3 the iPhoto program icon is banned and there is an error message that an update is required to run iPhoto, but the application store shows a message that iPhoto does not have any update available at this time. There is not even any iPhoto program available on the application store. Any suggestion on how to solve this annoyance?

mende1 wrote:
Unfortunately, Apple has removed both iPhoto and Aperture from the Mac App Store so they cannot be downloaded anymore. This means you are forced to migrate to Photos (included in OS X 10.10.3) or, if this app does not include features you need, look for a different app.
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Aristotle247 wrote:
After update to Yosemite 10.10.3 the iPhoto program icon is banned and there is an error message that an update is required to run iPhoto, but the application store shows a message that iPhoto does not have any update available at this time. There is not even any iPhoto program available on the application store. Any suggestion on how to solve this annoyance?
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Keyboard not working correctly after updating to 8.1 64bit pro.

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http://answers.microsoft.com/en-us/windows/forum/windows8_1-hardware/windows-81-keyboard-problem-cou...
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Hi,
Please put the units product no. in the link and check if your PC is tested by HP with Windows 8.1
http://www8.hp.com/us/en/ad/windows-8/upgrade.html
Let me know if you need more help.
I am an HP employee.
Make it easier for other people to find solutions, by marking my answer “Accept as Solution” if it solves your problem.
***Click on “Kudos” STAR to say thanks!***

While trying to access my local network I get the message..."The page could not be opened because server cannot be found." This, after updating to Yosemite and paying (again) for the server app.

while trying to access my local network I get the message..."The page could not be opened because server cannot be found." This, after updating to Yosemite and paying (again) for the server app.

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Scandalous!

IMac starts not correctly after update to Yosemite

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