Hi, I got some good news.
I read your reply again (actually this is the 6th time), you did mention to try choice the HDD media page, so I try press the HDD, and from there, it let me change channel now...
What a relief, and many thanks for your wonderful advice, I still don't know why the problem exists before, from now on, I would stick with the 'HDD' page, after 2 evenings and a whole weekend, I am so exhausted, I still don't know what had happened, I just very cheerful and joyful for this moment.
I know there might be still a long way for me to get used to this 'alien' player but I am so happy and grateful to know this forum is so helpful and wonderful.

, i couln't thank you enough.
Thanks...thanks.....thanks!!!