13" macbook, My screen will go black if I tilt my screen back, but when I tilt it back forward it goes bright again.

I have an issue with my macbook's screen. When I open up my macbook, everything is fine until I tilt my screen back to a comfortable/useable position. If I tilt the screen more than 80 degrees from my keyboard then the whole screen goes dark. It isn't shutting off, but it instantly dim's the screen to the lowest setting (more or less pitch black). If I tilt the screen back towards the keyboard everything is okay again. I'm really just confused. This doesn't happen everytime I use my computer and sometimes I can get away wtih 90 degrees or so, but the problem seems to be getting worse. Not sure what to do and applecare has expired.
Jim

It may even be the screen, no way of knowing for sure until you eliminate one potential cause. At least the inverter is cheap.
Directions here: http://www.ifixit.com/Guide/Installing-MacBook-Core-2-Duo-Inverter/1497/1
The part costs ~$5 on eBay.
Search here: http://www.ebay.com/sch/i.html?_nkw=macbook+inverter+-pro&_trkparms=65%253A12%25 7C66%253A2%257C39%253A1%257C72%253A5317&rt=nc&_sticky=1&_trksid=p3286.c0.m14&_so p=15&_sc=1

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To get rid of "pop-up ads and other crap on my computer when I am on the internet", click on Safari in the Menu bar, and select Preferences. Next select Extensions. Delete all of them. Restart Safari.
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Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.
Excerpt from
http://support.apple.com/kb/ht39

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christobell86 wrote:
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http://support.apple.com/kb/HT1430
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Hi
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http://www.macworld.com/forums/ubbthreads/showflat.php?Cat=&Board=UBB13&Number=2 43591&Main=243591
Steve

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Hello polo-angulo,
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13" macbook, My screen will go black if I tilt my screen back, but when I tilt it back forward it goes bright again.

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