I've already had to do this on several occasions of flying into the US before the laptop ban. There were signs at the airport saying that all electronic devices

I've already had to do this on several occasions of flying into the US before the laptop ban. There were signs at the airport saying that all electronic devices being brought on board had to had sufficient power to be turned on to be checked. I've also seem similar signs at courtrooms in the US for checking cell phones when going through security. It seems like a more sensible approach than banning the entire laptop.