Okay I was angry when my new chrome book had a blank screen and wouldn't turn on.  Before returning it to Acer I looked up my unit.  There was a hack for getting the screen to come up.  You have to do a reboot of the system by holding down the power key until the blue light on the side goes off and then closing the cover.  Then wait a few second and open the cover.  The log on screen came up.  Also check to see if the brightness had been turned down as that may be a problem as well