If you can't power it on, you can't take it on.
The Transportation Security Administration is issuing new rules for some passengers heading to the U.S from overseas.
It won't allow powerless devices like cell phones, DVD players, and laptops onboard aircraft.
The TSA is asking some of the 250 international airports with direct flights to the U.S. to have some passengers prove they can power up their electronic devices before boarding.
Officials are concerned that terrorist bomb makers could be hiding explosives in those devices.
According to Ray Kelly, ABC News Consultant and former NYC Police Commissioner, "They are small items but it takes very little explosives to penetrate the hull of an aircraft and cause catastrophic damage."
Homeland Security Secretary Jeh Johnson said, "I believe that we've taken the appropriate measures to deal with the existing situation and not unnecessarily burden the traveling public."
The changes come in response to potential new threats from terrorists in Europe and the Middle East.