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Sometimes when I startup my Mac, I notice that the menu bar doesn't load fully. It remains completely transparent and doesn't have a title (or any menu options) for the current application. It doesn't even have the Apple logo on the top left side.

Here's a picture of what it looks like:

enter image description here

Any idea what causes this or how to fix it?

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This happens to me too sometimes. A guaranteed solution: Restart the menu bar. Here's how:

Open Terminal (/Applications/Utilities). Type: killall SystemUIServer.
killall restarts the following process, and SystemUIServer is the process in charge of the menu bar.
Once you press enter, the menu bar will disappear and reappear. It should be working fine.

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It happens to me on a Mac Pro with 8 cores and 10GB RAM, but it usually goes away when you just switch to the finder back and forth another app, since the new app must refresh the bar. – Martín Marconcini Mar 1 '11 at 20:52

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