I am able to reproduce this problem routinely on a T20 laptop.  If I
boot "cold", the boot completes and the system runs normally.  If I try
booting while the machine is still "warm" from previous use (e.g.
running Ubuntu), it hangs as described with the dark screen and just the
"-" in the upper right portion of the screen.  If I unplug the adapter
and let it "cool" for a while, I can boot it successfully without any
perceived problems.

I am funning version 7.10 and, although quite knowledgeable generally
with computers, I have no prior experience with Linux.

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X.org does not initialize screen on IBM T20, T21, T22
https://bugs.launchpad.net/bugs/33617
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