You loaded a firmware update for a different region, and then used the service menu to make additional changes?
Dear Samsung HD Tech
Some times when my TV is turned on just a grey screen is shown but sound is heared and other functions also work foe example the source could be changed or Mute and etc. and some times it's just a black screen and no sound but the startup sound is heared when TV is turned on. I have had both before updating firmware but it happens more after upgrading firmware.
actually turning off and on solves the problem.
I wondered if this is a software bug or my new TV needs service after only one month?
I use a satellite reciever and connected it through HDMI1 so TV is usually in that mode and is turned on
I have updated my Palsma from V.002006 to V.003000 and problem still exists. (and I noticed that V.002006 is a Persian interface that is neither in samsung local or global sites available but V. 003000 is for Europian TVs.However I installed that version and by a little changes in System menu like "flip vertical" it works better than previous version like it plays large divx files from Ex.HDDs)