Just installed a new kenwood KDC-210U and all it does is flash protect even after reset, help please

SOURCE: Kenwood kdc-mp"635"------ protect "help"

I have a kenwood kdc-mp635 and when i turn on my radio it reads protect...i recently bought it a month ago and it was all fine till a couple of days ago i was driving and it turned off and said "protect"! i reseted it and it worked for like literlly a minute then back into protect mode.. i check all my wires, amps, grouds, cdplayer wiring and cant seem to find the problem... before when i reseted it, it worked for a minute then went into protect....now it doesnt even turn on anymore all it does is reads "protect" i reseted it and still nothing....it doesnt turn on after i checked all my wiring and grouds...im stuck and in-need of help..i have no musicccc.....no radioooo...!!! i dont know what else to do?????

SOURCE: Kenwood KDC-MP438U "USB ERROR"

IF YOU DID NOT PRESS THE RESET BUTTON NEX TO THE USB PLUG, DO IT. IT WILL REINITIATE THE DEVICE TO THE FACTORY; YOU WILL HAVE TO ADJUST THE CLOCK.
I DID BECAUSE IT WAS WORKING AT FIRST.( PAGE 3 OF THE MANUAL)
CLAUDE

SOURCE: Kenwood KDC-X492 where is the reset button????

if you have the excelon
then its in between the aux input and usb interface

SOURCE: protect mode

Press reset button (small circular button need something with a point) to the left of the 1 channel

SOURCE: Kenwood kdc-bt742u flashing protect and no sound

If protect is coming up on the display, it means the system is detecting a short somewhere on one of the speakers and so is turning the amp off to avoid damage.
Check all the connections at the back of the amp to ensure they are not shorting, and at the back of each speaker, if nothing is found there, check each wire for damage, or a bare wire touching the body of the car