my television

[driverdale1]

hi, any tv engineers out there?..i have a plasma tv that all of a sudden, a black 2 inch line appears from top to bottom just off centre, it comes when you switch the tv on ...lasts from a half hour to 3 hours or so ..goes away , comes back....anyone any ideas whats happened?..tv is about 3 to 4 years old, thanks in advance.

[No,Knowledge]

you have planted it to near the beetroot!

[driverdale1]

sorry i shoulda put serious answers only...but i guess the kiddies are off school now