MacBook won't boot, stuck on Apple Logo, and after white screen

Hi Guys,

My macbook won't boot, and stuck apple logo, and after white screen.

I think this is a hardware probleme, but I tested the hard disk, and it has perfect condition. After I tested 2 memory modul, no problem.

I made a bootable yosemite usb pendrive, and boot with this, appeared apple logo, and after white screen.

thank you for answers.

Tibor

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