The apple image (apple menu) in upper left corner, I clicked on it somehow and something happened. Normally it is always black, clicking I am there, or not. Now, if I click there (for example need to put mac sleep), the apple icon changes its colour - surround it blue colour appears and apple itself becomes white. Is it any error, for what is it good and how can I get my all time black apple back?

What you're describing sounds like the normal visual highlighting when you click and hold on a menu bar item -- if the item stays highlighted after you let go of of the mouse [or trackpad], first shutdown/restart the computer, and see if that makes the persistent highlight go away. If that doesn't work, I found two suggestions -- however I can't vouch for either of these or elaborate on them, you'd want to call Apple tech support if you need further explanation.. Two suggestions from Apple forums for dealing with persistent menu item highlight: - Try doing a Parameter RAM reset - hold down apple/option/p/r keys at start up and wait for three chimes before releasing the keys. - Under [ System Preferences > Trackpad > ] "Trackpad Options", make sure "Ignore accidental trackpad input" is selected.

Yes, it still seems like normal doing, as it disappeared if I let go trackpad. Only when I clicked on apple menu, it shows me some light then and screen turned black, after that a lighten display got back itself or I had to pull the trackpad, I don't remember correctly. Why the screen turned black and before had a light? I don't have trackpad options. In system preferences trackpad I only have: point&click, scroll&zoom and more gestures, and nowhere there is ignore accidental trackpad input, to select for...

I really can't understand this last description, it's far too vague to follow.. "shows me some light"..? " a lighten display got back itself"..? As I said I can't vouch for either of those suggestions -- I just passed them along -- and if the issue you're trying to describe is in fact something related to a trackpad, then, again, as I said I can't elaborate on that, I have an iMac and a mouse. It may be time for you to contact Apple directly -- their tech support is far better suited to troubleshooting general OS problems [they're set up to have you share your screen with them so they can see what's going on]. This forum is intended for user discussion on audio & video software, it's not equipped for the kind of tech support where you really have to see a computer-specific problem in person to diagnose it ..