Display - Black rectangle on upper right corner.

After some reboots, for any reason (updating software, etc.), a black rectangle approximately 3" wide and 1" high shows in the upper right corner of the display, about 1/3" from the display sides.
Restarting the laptop, sometimes twice, makes the black rectangle disappear.
I have been unable to recreate any situation where the black rectangle appears, or disappears. It seems to be random.
What could be the cause, and remedy?
Although not very young, the laptop works fine.
Another question, NOT related: is it possible to use a SATA internal HD in this PCC laptop? Its current HD is an ATA Toshiba.
TIA
Charly

My guess is bad video RAM, but I suppose it could be a bad graphics chip or even a bad LCD connection. Try scrounging an external display and see if it has the same problem. Try gently flexing and squeezing the screen a little when this crops up. Unfortunately, bad VRAM is a permanent part of the main logic board.
No, SATA drives won't work inside the PB G4. I think I have heard of adapters, but I doubt they would fit.

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