MacBook Pro 5.1; varying display brightness
MacBook Pro 5.1; display brightness slowly increases then decreases in a cycle of about 2 minutes. Not a big difference but noticeable. Any hints?
Apparently the display is working, but its backlight isn't on. First make sure it isn't turned all the way down: press the F2 key to turn the brightness up. If it doesn't brighten up when you do that, something has been damaged and will need to be repaired. If wine was spilled on the screen and ran down into the plastic hinge housing and the base of the screen assembly, it may have shorted out the LEDs that provide the backlighting. Your machine is out of warranty, and if you had AppleCare, the spill has voided it. The Apple remedy will be to replace the entire screen assembly, and possibly also the top case and logic board, depending on how far inside the wine got. So you may want to look for an independent third-party repair service that can fix it with used parts, or you may want to do the repair work yourself with used parts and the well-illustrated take-apart instructions at iFixit. com:
http://www.ifixit.com/Guide/Browse/Mac
iFixit sells used parts, too, and so do these other vendors:
http://www.pbparts.com (parts and repair work)
http://www.dttservice.com (parts and repair work)
http://www.powerbookresq.com (parts and repair work)
http://www.tekserve.com (parts and repair work)
http://www.powerbookmedic.com (parts, repair work and instructional videos)
http://www.welovemacs.com (parts and used equipment)
Good luck!
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Hi alangium,
Welcome to the Support Communities!
Resetting your computer's PRAM should restore your Macbook Pro's screen appearance.
OS X Mavericks: Reset your computer’s PRAM
http://support.apple.com/kb/ph14222
This article may provide some information about your Mini DisplayPort to AVI adapter. Have you tried to connect a different VGA monitor to your Macbook to see if you get the same results?
Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
http://support.apple.com/kb/HT3382
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Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573#5
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I hope this information helps ....
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