MacBook Air failing to project correct screen

When I connect my MacBook Air to an external projector everything seems fine but when I turn on slideshow mode in PowerPoint I see the slideshow on the laptop and not on the projector.
I've tried adjusting the primary and secondary screens in the display control panel - no joy.
I've tried mirroring displays - no joy.
All that is projected is the presenter screen which shows my notes and the next slide. i.e. the laptop is projecting the wrong way round. Any help really appreciated.

The keyboard and trackpad reside on top of the motherboard and all the components of the computer. The keyboard and trackpad are not liquid proof. It is VERY likely that the liquid made its way to the motherboard and has affected those components. If EVER there is liquid spilled on a computer, the last thing you want to do is A. Turn it on to make sure it is working.. and B. Plug it in and charge it. Do the EXACT opposite. Unplug and turn off all power, and, if possible, remove the battery from it. The liquid itself doesnt do the damage...the damage is done when the liquid comes in contact with the circuits and shorts out the contacts and components. You could try to connect to an external monitor, if you have the means to do so, to see if it makes a difference, but it probably will not. I seems that the motherboard is not functioning correctly.

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Hi, thanks for the response. I did try most of these steps and they did fail on me.
I decided to take my laptop to the approved service providers. Luckily my laptop's issues could be resolved by the technicians. They found that the power supply chip was faulty.
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The keyboard and trackpad reside on top of the motherboard and all the components of the computer. The keyboard and trackpad are not liquid proof. It is VERY likely that the liquid made its way to the motherboard and has affected those components. If EVER there is liquid spilled on a computer, the last thing you want to do is A. Turn it on to make sure it is working.. and B. Plug it in and charge it. Do the EXACT opposite. Unplug and turn off all power, and, if possible, remove the battery from it. The liquid itself doesnt do the damage...the damage is done when the liquid comes in contact with the circuits and shorts out the contacts and components. You could try to connect to an external monitor, if you have the means to do so, to see if it makes a difference, but it probably will not. I seems that the motherboard is not functioning correctly.

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Well, since upgrading to Mavericks, I started watching a movie. Suddenly the screen dims and then goes black. Trying to waken my MBA means I need to restart. I have turned off all the sleep fuctions for the monitor and the hard drive. Still is happening??

MacBook Air failing to project correct screen

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