Yosemite White Screen Boot Fail

Hi,

I have a big problem. After my mac updated via mac app store I cant start anymore.

My system is yosemite.

When i start the mac i can hear the apple sound and see the apple logo. But then after the progress bar it starts again. It seems my mac stucks in a boot loop.

I took my hard drive out of the computer and tried several boot options like shift etc.

In the end i tried the internet recovery method. It loads everything but when it should come to the OS Window i get the White Screen (of death).

Can i solve this or should i go to a repair shop? I hope you can help me. Thanks.