picture?

i bought a technosonic 26" tv on ebay on 1st december 2008, the picture appeared blank when i switched on the following morning after experiencing no trouble the night before ! the sound is ok but no picture . the other problem i find with the set is that as the scart lead plugs in the back of the set upwards, it tends to work itself out with the slightest movement of the set and i constantly have to push it back into the connection, the set is bearly 9 months old !anyone got simmilar problems?