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It sounds like you have some foreign objects on the inside portion of the lens or the actual mirror...since you have already tried cleaning the exterior of the lens, I suggest taking it to a qualified camera repair shop....or, if it is still under warranty, take to the store where it was purchased...
Other than sending the camera to the shop to get replacement, you can do this method to temporarily solve the problem. Set the camera to P mode, go for Sensor Cleaning Mode, Manual Cleaning, and clean now... You will then hear the mirror lock and followed by ERR99! All you have to do now is to shut off the camera, take off the battery and waith few seconds. Reinstal the battery and immediately you'll hear the mirror resetting itself. The camera should be working just fine for now until you shut it off next. I suspect, this error are linked to the mirror or sensor lock up thingy....
Take the lens off and carefully lift the mirror - if the sub-mirror underneath the main mirror doesn't follow the main mirror up, the stop-pin has broken off and has to be repaired by a camera shop. A common problem.
This suggests the mirror is stuck up in the take position.
Remove the Lens and look at what is behind it
In the rest mode you should see a mirror.
If it is stuck up you would see the sensor window
Which do you see.
with the lens off - can the camera be switched on?
This might just drop the mirror
The mirror is surface silvered - do not touch it.
If it still up then it is a repair shop/warranty replacement job.