I have had several panasonic plasmas and they all turn on the same.
I have found that you have to keep the on button on the remote pressed for a short time to get the power light on the tv to flash.
However keep it held down too long and the tv will turn off so would appear to not turn on at all.
No idea why panasonic do it like this surely on is on?
Not sure if this is what you are describing?
KEF 3005SE, Onkyo 606, Panasonic BD30, Panasonic TX-P42V10B, Sky+HD