Hello. I have a strange problem with my set-top box and exactly yesterday I still had everything OK, the image and sound was OK via the HDMI cable, today I turn on the TV and suddenly there is no picture, but the sound and frames as you switch channels, there is also no image in the materials recorded on the disk. I changed HDMI to SCAR and the image is back but there are black bars on the sides. My set-top box is PVR BOX + and the toshiba 40l6353dg TV.