I cant start my machine.  The screen only turns grey and then shuts down after 1 minute.  it looks like it working, but nothing happens.

I cant start my machine.  when i push the starting button, the screen onely turns grey. it looks like its woorking, but nothing happens. 1 year old

You need to re install OSX. If you have the dmg file downloaded via torrentz this is how you can create a bootable external HD or Flash drive (8 GB+)
https://discussions.apple.com/message/23957654#23957654
Peace
Harry

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