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Purple vertical lines, then white screen on sta...

My late 2011 MacBook Pro has recently developed pink/purple vertical lines when I restart the computer. The Apple logo appears for a short time (until the loading line below it gets to about 15% complete), then the screen goes white. After a while the fan starts working hard. Safe mode start up does not work. The laptop has 16 Gb RAM and plenty of hard drive space available.

What is the likely problem that I am experiencing? How might I address this problem?

Try resetting NVRAM;

How to reset NVRAM on your Mac - Apple Support

Run Apple Hardware Test:

How to use Apple Hardware Test on your Mac - Apple Support

Try resetting NVRAM;

How to reset NVRAM on your Mac - Apple Support

Run Apple Hardware Test:

How to use Apple Hardware Test on your Mac - Apple Support

If macjack's solutions do not correct the problem, you will need to seek professional help. Such symptoms indicate failed graphics hardware, a failed display, of failed display cabling.

You can do a bit of diagnosis to see which one if you have an external monitor and a way to connect it:

1) If the problem also shows on the external monitor, the internal video hardware has failed and only a new logic board can fix it. Considering a logic board replacement can cost 1/2 to 2/3 of the cost of some new Mac notebooks, you have to decide to repair of replace.

2) If the image on the external monitor is unaffected, that point fo the dispaly itself or the cabling. A disply is not cheap but probably less than a logic board for a non-Retina MacBook Pro. Cabling could be the simplest fix.

NOTE: The age of your MBP bring into play  Apple "supported/vintage/obsolete" repair policy. In most places, Apple does not provide either parts or repair service for computers that have been out of production for more than five years. Your five years on that nmodel ran out last June. For the full policy, please see this:

Vintage and obsolete products - Apple Support

Although Apple will not fix it, some Apple Authorized Service Providers (AASP) may. It depends on if they have parts inventoried.

最后更新：2017-08-29 05:30:57

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