I bought a used A1283. The screen is barely visible, and when I turn the monitor and it is clear for a 1/4 second then barely ther?

I just bought a used A1283.  I took it to Best Buy to see if they could make me the administrator.  They said that having seen lines vertically on 'their' screen and on mine as well.  I never noticed at home only matter of freezing.  They said that the graphics card is out?  Now I have a scren for a millisecond until it's so dark I can barely read.  When I turned off the moniter and then it's clear just for a millisecond, then dark?  Help?

-Try to reset memory NVRAM/PRAM and SMC

MacIntel: Reset of the controller (SMC) system management

Subject of memory NVRAM and PRAM

-Try to start safe mode

OS x: what is Safe Boot, Safe Mode?

-Start to recovery and repair the startup disk

OS X: on OS X Recovery - Apple Support

If no recovery (this is Lion or later) them start from the installation DVD instead

-If it is repairable reinstall the OSX

How to reinstall OS X on your Mac - Apple Support

Or the installation DVD or Lion or later

However, I suspect a bad graphics unit. The graphics unit is soldered to the logic board and is not replaceable.

Tags: Mac

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