stupid logic board failure on an ibook

Well, I think this has finally cured me of being a mac fan. I don't
know what annoys me more, the horrible quality control or their
refusal to actually admit their constant, egregious design flaws.

My AC adapter goes out, I go to the apple store, the guy resets the
PMU. I bring it home, and a few hours later I get the black bars and
freeze. I'm convinced the people at the apple store broke it, but not
much I can do about that.

I am curious as to whether this problem deals just with the display or
does it go deeper? I lost track of the monitor adapter (never needed
it), and I'd be willing to get another one and a monitor if that will
bypass triggering whatever freezes my ibook now. Anyone know?