Are you holding the power button until the console powers off?
If you hold it long enough it should power off properly, then you should be able to turn it back on. You'll most likely get a message about improper shutdown, but that's expected.
Think about disabling functions in rest mode (Settings) > [Power Save Settings] > [Set Features Available in Rest Mode].
The flashing orange light means it's attempting to download something.
If you have any rest mode functions enabled, the console will enter rest mode when you press the power button. To shut down fully if rest mode functions are enabled, you have to press and hold the power button until it shuts down.
