After updating my iMac 27, the dock not work

alo staff.
after upgrading my iMac 27 (2009), and try to install the "absinthe" - and having to disable the security options of the gate-keeper. my dock crashed, hidden to touch the mouse, not being active this option and the desktop image appears all gray (only the bottom, the icons do not change).
I'm worried because it installed on my macbook pro is okay.

If the problem is in your device, we can't help with it, but it's in your computer. Open Finder, select Go with Option key and press Library. Then, go to Preferences and erase com.apple.dock.plist. Open Terminal and type killall Dock

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After updating my iMac 27, the dock not work

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