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This is a 15" 2010 model that came with OS X 10.6 and now has 10.10 installed. After turning the computer on I can hear the startup chime and the power adapter indicator light lights up. The Apple logo and a progress bar appear, but after that there's only a blank white screen.

There are some pixel anomalies, what appears to be scanlines and slightly distorted colors that look like it's running in 16-bit color depth.

I have tried following the official instructions, i.e. reset the PRAM/NVRAM and SMC, tried booting in safe mode (same symptoms, but after that it seems to boot automatically in safe mode since the loading takes a lot longer).

Also I recently installed Homebrew if it might have to do with this.

Any ideas?

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    Try booting in verbose mode by holding command + V while booting, and see where the computer stops. Post an image here. – William T Froggard Jun 28 '15 at 16:51
  • @WilliamTFroggard It seems to stall with this screen. – zenith Jun 28 '15 at 18:24
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This was apparently some known issue because when I took the computer to be fixed, they simply replaced the motherboard for free.

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