Your television has frame collapse (total loss of height). If left on with a horizonal line you can burn the phosper, leaving a permanent line. Frame collapse is very common and easily and inexpensive to repair, usually by replacement of the frame I.C. itself and/or resoldering work. Take it to your local TV service center.
Cobweb
September 2004
unplug your tv for about six hours,then plug it in again, then turn tv on.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix televisions.