Factory Reset Samsung LCD Television LN-T4671F

How factory reset samsung lcd television ln t4671f ? my samsung ln-t4671f takes 3 to 10 minutes to turn on. it just clicks,clicks clicks ?

Answer:
The power supply board is dying,that the board where the power a/c cord into it.Replaced the power supply board will stable and work as normal again.Tries Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.