Help needed:LCD TV not showing any power up lights

My sony LCD model no is KLV-26S200A/BTH6
Recently when i switched on my tv,no red or green power light is displayed and the tv doesnt power on
NOTE: i have referred to the local engineer n he has checked the internal circuits,everything is working including the supply chords
Yet the tv doesnt show any stand by or power mode light
Is this related to software update issues
Kindly help to solve this problem.