I am doing a training - one of the student Laptops is going into standby unexpectedly every few seconds to minutes. The batteries were pulled for shipping. Defnitely standby - Fn-F4 brings it back out. I have looked at power schemes and turned everything off. Does not matter if you are active or idle - shuts self down. But does come right back up. What else can I look at besides power? Even monitor is not showing anything.