horizontal black line 8" from top of 50" Samsung Plasma TV

2 Days ago a black ine appeared across my 50 inch Samsung Plasma TV. It is about a year and 5 months old. PN 50C430AID. It is Christmas Day but I wil call the Canadian # above next business day and let you know what happens!
Not happy at all and warrenty has expired.

Thank you all and Merry Christmas!

Suz58