Hi Al,
You could try the Self-diagnostic menu and see if any errors are logged. 000 beside each entry means no errors logged. From standby, press DISPLAY, 5, VOL -, Power.
To do a Factory Reset, you need the Factory Mode. Refer to the attachment.
Have my doubts that much will be achieved here though. My feelings are Panel or T-Con faulty. But see how it pans out.
Bruce