2004 Toshiba TV 32A41 problem

Question

TV has a 1 1/2inch horizontal bar that distorts the picture at the top of the TV screen.  Could the vertical hold be out of adjustment?  If so, how does one adjust the vertical hold?

The problem started after a power outage;  the cable repairman says it is not a cable problem (another TV set in the living room was not affected). Could it be another problem?