Have tried without HDMI and using Analog input, but not getting any signal output to speakers. Have opened the AVR in the week end to get a peek inside. There is lot of dust, never opened once in the last 7 years. Also, found electrical leakage in all part of the AVR. Even though it uses 3 pin plug, it has only two power input terminals in the back. Added a wire separately to the body for earthing.
Found four fuses inside. Two of them were attached to the PCB in the side where the power line connects, and both got input and output power. There are another two fuses in a PCB in the center. There is no input / output power signal in those fuses.
Have to check if any decent service shops nearby who is ready to do the diagnosis. However, if it is going to cost high, I will ditch the unit. Using a vintage stereo amplifier along with KEF Q300 stereo speakers now and may sell other speakers.