If the radio will not turn on, first check the fuse located on the back of the radio. If the fuse is burnt, replace with a fuse of the same amperage rating. The guide to replacing the fuse can be found here.
How do I reset my Kenwood touch screen?
How do you do a hard reset on a radio?
Turn your car on, but do not start the engine. Turn the radio off. Hold the radio power button down for a few minutes until it resets.
How do I reset my Kenwood car stereo in Protect Mode?
How Do I Get My Kenwood Stereo Out of Protect Mode? Switch off the receiver for a few hours. Sometimes, that is all you need to do. But if that doesn’t work, press and hold the reset button for 5 seconds.