Thanks for your reply Spurosity, and sorry for the late response. I figured out the problem, which is nothing at all.
I frustrated with a striped screw as I was opening the button pannel, then I left it out to calm down a bit. And then it hit me, I read somewhere in the forum to clean the switches and such, so I used some good old WD40 on the channel switches.
While I was pushing it up and down, I noticed something. The position knob was way up the screen! I returned it to normal and voila, chanel A was there. This might look dumb, but I had no idea how to use this scope when I got it, and the first thing I was able to work was channel B, and I thought channel A was 'broken' within all that fuss.
Anyways, It's working well, I ordered two p6100 100mhz probes for that glorious achievement, happy as hell, and I'm thankful for your help!
Cheers!