External display no longer works after Mavericks install

I have a minidisplay port to DVI adapter that connects my Macbook Pro to my television through HDMI port (cable is HDMI to DVI).
This has worked fine for over 2 years, but as soon as I upgraded my Leopard OS to Mavericks, it stopped working.
A side topic is that my Android TV media centre also stopped working as it can no longer connect to my Macbook Pro (it used to work for the past few years).
What am I doing wrong? How can I solve my problems? I have tried everything on the forums, but nothing works at all.
Help, please, pretty please with sugar on top and a cherry!
Carlos

I'm not sure how installing an application would cause that to happen. Have you shut down (powered off) the iMac completely, and then restarted, since this problem occurred?
Some display settings are stored in PRAM, so if you have not already, try resetting PRAM
http://support.apple.com/kb/HT1379
If that does not help, you can try disconnecting the iMac from power and reconnecting it, using the reset SMC (power management) procedure.
http://support.apple.com/kb/HT1543
When you reconnect it, initially connect the iMac to a wall outlet, by itself. Leave all peripherals disconnected, except for your USB keyboard/mouse. Make sure it is working properly, then connect only the external display.
If it still does not work, as a test, start up with your Mac OS X installation disc. You are not installing anything, but note if the second display is displaying the background image or not when you are booted from a different system.

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      off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 1, Rotation 0
      UUID 0xffffffffffffffffffffffffffffffff
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    Mar  2 14:39:15 Nick-MacBook-Air-2.local com.apple.AmbientDisplayAgent[304]: AMBD Agent: xpc connection became invalid during event handler
    Mar  2 14:39:15 Nick-MacBook-Air-2.local DMProxy[613]: AMBD Services: connection interrupted: com.apple.AmbientDisplayAgent (Connection interrupted)
    Mar  2 14:39:15 Nick-MacBook-Air-2.local com.apple.AmbientDisplayAgent[304]: AmbientDisplayAgent started
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    Mar  2 14:39:15 Nick-MacBook-Air-2.local com.apple.AmbientDisplayAgent[304]: AMBD initializing devices
    Mar  2 14:39:15 Nick-MacBook-Air-2.local com.apple.AmbientDisplayAgent[304]: AMBD Agent: xpc connection became invalid during event handler

    Howdy Haknat,
    Thanks for using the Apple Support Communities.
    If you're still seeing no image on the external display after resetting the SMC and PRAM, then the next step I'd like you to do is to start the device in Safe Mode.
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    Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
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    Alex H.

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