yosmite shutdown at apple logo on my probook 4540s

[basasa]

yosmite shutdown at apple logo on my probook 4540s

is there a way to fix it or reinstall it without losing fles

notes :
its a yosmite clover with UEFI
i have tried to open with a flash drive (f4) and tried safe mode .. and same problem

 

[RehabMan]

yosmite shutdown at apple logo on my probook 4540s

is there a way to fix it or reinstall it without losing fles

notes :
its a yosmite clover with UEFI
i have tried to open with a flash drive (f4) and tried safe mode .. and same problem

Can you boot from USB?

Make sure the USB is prepared correctly.

http://www.tonymacx86.com/hp-proboo...-install-yosemite-hp-laptops-clover-uefi.html