Kwok,

Your settings will definitely NOT be there after the reset; make a note of them before starting. One thing that I've found useful is to take digital pictures of the on-screen display for all levels of the setup. I've done enough swaps, resets and firmware upgrades that it's very convenient to have a distinct description of how it's set.

gonk's idea of the SVC/OPR switch is a good one as well. Even if you haven't touched it, perhaps it was somehow "in between" and just started to make a contact with the "SVC" side of the switch.

Good luck.