nfoav8or I understood exactly what you guys said but I'm telling you after it says killing all processes, continuing done, mach reboot it does nothing else so how do I hold down the power button?

it won't let me boot up into my installed system because it stays on the screen where it says mach reboot?

Nfoav8or I'm a newbie not an idiot if you give me strict instructions I follow them. and that's what I did.