Goes black and when you tilt it comes back on.

Macbook model A1342  goes black and when you tilt it comes back on.  Is there a fix?

If your Mac is off then start up. As soon as you hear the boot chime, hold down the Option key until the Mac and Windows Disks show up. Then click on the Mac disk and the arrow below it. After it boots up in Mac then go to System Preferences>Startup Disk and select your Mac partition as the Startup disk.
If you are in Windows then look for the Boot Camp icon on the taskbar. It will look like a gray box sitting on one corner. One of the options when you click it is to restart in Mac OS. After it boots up in Mac then go to System Preferences>Startup Disk and select your Mac partition as the Startup disk.

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