Check the batteries. Place lithium cell in the remote. Be sure the (+) and (-) ends of the batteries line up as marked inside the battery compartment
Clean the remote control and the remote control sensor window on the TV
Check the TV power cord. Unplug the TV, wait 10 seconds, then reinsert the plug into the outlet and push the POWER button again
Be sure the fuse is not blown on the AC power strip, if one is being used
Check to be sure the TV outlet is not on a wall switch
Be sure that the remote is in the correct operating mode
Be sure the remote is pointed at the Remote Sensor Window on the TV