I tried the procedure given in microsofts notes: Hold down sound-decrease button and push on power button but it reads my flashdrive (light flashes) but the screen behaves the same as if I did not have the bootable disk in the USB, ie it goes to the screen where I put in my pin and then the standard desktop screen. Also tried to make it look for boot in the USB by changing order of looking for boot drive; followed MS notes: hold down the volume-up button and push the power on button but it boots up normally and does not give me any options to change the drive for booting, Thanks for your help.