Macbook pro won't detect VGA display

My MacBook Pro (15-inch i7 Early 2011) won't detect an external display using an apple mini displayport -> VGA connector using 10.7.3.
All cables and the monitor are fine because my white macbook detects the LG monitor without any problem.
I have read and tried every 'sollution' suggested on the internet, but all fail. Since my MBPro can't even detect my Sony LCD TV (my white macbook does) i suspect it's a firmware/hardware issue.
I want to buy a thunderbolt display, but am not sure if i can spend all this money when even this simple VGA connection won't work.
Has anyone the same VGA detection problem but with a working thunderbolt display connection?
[s]

The warranty must be close to running out. Take it ASAP to the Apple Store or AASP and have it checked.

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Welcome to Apple Support Communities.
The article below provides troubleshooting tips that may help you resolve the issue with your MacBook Pro no longer recognizing the external display.
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
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