My imac menu bar keeps flashing

my mac os x menu bar keeps flashing. i cant even click on them cos it keeps appearing and dissapering. any help please

First you must figure if this is a system issue or user issue. IF you can, create a Test User. If the test user is affected Reset the NVRamm (Hold Command,Option, P, and R upon restart until you hear a second start up chime).
Repair disk in disk utility boot to The Mac osx install disk (hold C with the disk in upon restart. On the toolbar go to utilies and run disk repair on macHD). and repair permissions too
If that fails an Archive and install is an inconvient option
If its a  user specific it can be more complicated an Archive and Install may not. I would try pulling out the Com.apple.Example.plist files (They are found in (homeuser)/library/prefrences
i would try finder plist first then maybe even all of them if it comes down to it.

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    Have you tried a restart?
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      Macintosh HD (disk0s2) / [Startup]: 499,25 GB (323,02 GB free)
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