Vertical stripes on screen, can't boot into Mac

[macak6]

Hi,
How you solved this issue?
thanks

 

[badders46]

I saw this old thread while googling a solution for a similar issue - my mac mini would not boot at all, after the apple logo the screen will go dark and come back up as a frozen white screen with subtle vertical lines.

So if anyone comes here still looking for a solution, I managed to fix mine today after taking it apart. The thermal paste on the GPU chip / heatsink was very brittle - cleaning and replacing that alone most likely would've fixed my issue, however I went one step ahead and used a heatgun on the chip for a couple of minutes to reflow it. Baking the entire board seemed a bit overkill since it's clearly the GPU chip alone causing the problem.

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I purchased a Mac Mini 2011 a few weeks back intending to use it for spare parts. I had been warned that the graphics was failing so I installed an old hard drive from another mac mini and to test it out and to my surprise it booted after a reset of the PRAM/NVRAM. Next time I booted it it was displaying the vertical broad pink lines so back to square 1.
Toook the logic board out today cleaned up any heatsink paste and applied the heat gun directly to the AMD chip from about 1-3 cm away for no more than 2 minutes. If it was cooked - too bad. Have now reassembled everything and fired it up and shut down 3 times and has worked perfectly. I am amazed - so thanks for your info rxx. Now to see how long it lasts without failing again.

 

[antunesaa]

I saw this old thread while googling a solution for a similar issue - my mac mini would not boot at all, after the apple logo the screen will go dark and come back up as a frozen white screen with subtle vertical lines.

So if anyone comes here still looking for a solution, I managed to fix mine today after taking it apart. The thermal paste on the GPU chip / heatsink was very brittle - cleaning and replacing that alone most likely would've fixed my issue, however I went one step ahead and used a heatgun on the chip for a couple of minutes to reflow it. Baking the entire board seemed a bit overkill since it's clearly the GPU chip alone causing the problem.

Same here. Let me see the thermal paste...