my tv did the same, with the standby light flashing.
try unplugging the power cord for a minimum of 4 hours
if this works, I suggest not to ever turn it off again I turned mine off and was able to reset it only one more time the second time it would not reset I'll never buy a Sony product again
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix televisions.