Sanyo DP50749 50 in. Plasma TV "lcd clock dim" Questions

...LCD/DVD FDM- 0700A that has no picture with either the TV or the DVD. It has sound and the clock is working. Can you help? Thank you Use the source button to ensure that souce is not set to the wrong ...

...clock etc. and this causes the buzz, like when you dim your lights at home. I hooked it up to a surge-protector for clean power and just switch it off over night. During the day it's hard to hear ...