Strange Flash at the start of the Mac.

I have a 'strange' problem that appears each time you start:

After entering my user password, my MacBook Pro 13 "2015 starts loading desktop environment. Just 1 second before the full load, a strange Flash appears on the desktop with red, blue and green lines on a black background. This occurs during only 3 milliseconds, but sometimes it makes me fear.

Is this a problem? The GPU is a failure?

After finished reboot, the PC works perfectly without flashes.

Model: MacBook Pro 13.3 inches 2015

RAM: 8 GB

Processor: Intel Core i5 - 2.7 Ghz

GPU: Intel Graphics 6100-1536 MB

Thank you.

Velocità processore: 2.7 G

L3 cache: 3 MB

Memory: 8 GB

Check the cable connections if you are using an external LCD display

do you have this beign with 10.11.6, it is possible that there is a problem with the drivers or the resolution of your screen.

try restarting in safe mode

https://support.Apple.com/en-us/HT201262

If the problem is not the case, it could be a number of part 3.

If this is not the case, change the display of your resolution and reboot.

If the problem persists, test your GPU

Using Apple Hardware Test - Apple Support

Despite this test, it is possible there is problem with your GPU and Apple can do a stress test at an apple authorized repair facility, preferably an apple store. The stress test is not run by AHD

Tags: Notebooks

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