Harmon Kardon Receiver Shouldve Bought The 254 How Do I Reset The Memory On My Harmon Kardon Receiver Avr 235?

How do i reset the memory on my harmon kardon receiver avr 235? - harmon kardon receiver shouldve bought the 254

my receiver is off and said he is protected. used to combined fine, until the son of pregnant more work. Could be bad cable? I read the manual, but .. not very helpful would be the best way to restore possible? Please help !!!!!