Yosemite 10.10.3 Second screen big problem

10.10.4 has FIXED this, yes!

Anyone still having this problem after the 10.10.4 update?

I'm very disappointed.

I tried the 10.10.4 update and then I experienced the same pattern: ***Kernel panic*** > reboot > and then the same flicker in my external screen.

I rolled back to 10.10.2

@LCranston

Ditto to your comment about disappointment with the quality of service from Apple with Yosemite.

(Longtime Apple customer thinking seriously about going elsewhere.)

Hello,

I can really understand your frustrations, but the thing is, you are comparing 2 completely other versions of Mac OS X, its like comparing Windows XP to (what is about to come) Windows 10. You have to understand that (in opposite of Windows), Mac tries to improve its software in places normal end users wont look (under the hood). Apple is continuing improving and reassembling everything under the hood what we can't see als normal end users. and as a bonus they add tiny and big upgrades for some what improves the system even more. Whenever i talk for myself, updating from 10.6 to 10.10 is a pretty large improvement to me because there are all new kind of things like how to update the software, that goed trough the app store now, they added a hidable widget-sidebar (very pretty and useful, big improvement for dashboard when asking me). The Dock has changed back to 2D... the spotlight has moved to the midsection of your screen and things... lets say 10.6 compared to 10.10 (and 10.11, witch is currently in beta), to me thats a pretty big upgrade. but when you do every upgrade at it released-moments, than it doesnt add up any mindblowing new things.

Windows just tries to amaze everybody with all their new graphical interfaces, because simply NO os of them looks the same in general and first looks. Thats the reason that im using Mac, I'm a pretty flexible person I can deal with many Operating Systems. But there are way to many people who cant stand all those graphical changes and getting used to handling different in what they are doing because their home pc has windows xp, their school pc has windows 7, and where they exchange to they are using windows 8, it drives most student nuts! Me as a student can say, it doesn't really matter what version of OS X I (or someone else is) using, they simply now their way around in it, and they now how to work with it. The fundamental parts are still the same, like how to use the OS X!

bottomline what im trying to say is, apple really does improve its OS X's, you only have to accept that yosemite has some "under the hood problems" because they started yosemite based on mavericks, but with lots of extra futures that makes Apple had to recode and fix again, lets get real, there are still beta-versions available that are trying to fix these this.

__________________________________________________

my conclusion is, if you are feeling you have some issues with
your Mac, just downgrade it. Even if you have to do it the hard

way and lose everything and reinstall and set-up everything.

Just partition your hard drive in 2 (or an extra) save your

importment data on it, and reinstall a clean OS over your

existing hard drive. wipe it clean and start with the BASE OS,

and update it to the version you like it the most.

I know this is very hard for you to hear, but you never now if

an upgrade to another OS X is going to make your life better,

no OS is 100% perfect after all, but in my opinion Mac OS X

is the best (compared to windows lol.)

Hi, guys!

I got the same problem on Yosemite 10.10.4 .

My solution

System Preferences -> Desktop & Screen Saver

Change your desktop background picture to any of the standard OS backgrounds (I picked the Yosemite 2). Now my both displays are back to work again.

Suspected reason - something wrong with the customized background picture resolution and/or ability to display it at the system startup...

Good luck!

RL

This does not work for me.

The flicker remains with 10.10.4

I resubmitted the issue in apple bug report

I have solved my problem. I bought new cable thunderbolt->hdmi from Mushi.