SA-HT730 need help with the above problem it just shows INIT and nothing else happens

Are you trying to reset the password for Ratings or re-initialize the unit to all factory defaults?

http://www.retrevo.com/support/Panasonic-SC-HT730-Home-Theater-Systems-manual/id/356ci961/t/2/

Page 27 shows one instance of INIT.

Re-initialize Setting

This returns all values in the Setup menus to the default settings.

≥Yes: The password screen is shown if "Ratings" (??? page 26) is set. Please enter the same password. After "INIT" on the display disappears, turn the unit off and on again.
≥No


Page 36 shows how to reset everything.

You have forgotten your ratings password. Reset all the settings to Factory Preset.

While stopped and "DVD/CD" is the source, press and hold ['Square Icon' button for STOP] on the main unit and [S10] on the remote control until "Initialized" disappears from the television. Turn the unit off and on again. All settings will return to the default values.