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I really don't know why but, when I'm on Safari and I'm on Facebook and then I receive an instant message, the pc freezes. And there is no way to make it working back. I can only shut down it by pressing the power button for a long time. Maybe the cause is the notifications? I Really don't...

Hi folks, I need your help to solve my very frustrating problem. I was build my custom Mac a few weeks ago and i was so proud of it. The custom Mac works fine without any errors. After a few weeks, suddenly I cannot enter "El Capitan" because a Kernel Panic screen appears during the boot...