Mangiasaette

i've used chameleon... finally i've installed yosemite, but now at boot there's a problem, can't load the kernel and start only with usb...

...it's the same... 

I've foilow the guide of Jake Lo on Yosemite on E7440, but... everytime my pc reboot before the logo appear... where's my fault?

i've an Intel i7-4600U Cpu @ 2,10 GHz 2,70 GHz, Bios downgraded to A08, motherboard dell (sorry, but i've no idea what's her name), intel hd graphics 4400, 8gb ram, 256ssd...

can you help me?

thanks