Thank you for the response.
This is an Aspire R7 371T laptop.
238.47GB Toshiba (SSD)
Intel HD Graphics 5500
No external monitor available until April. (I'm traveling)
The first evidence of a problem was a "persistance of vision" - I could "see through" a dark field background to the desktop icons - the icons could be seen very, very faintly through the dark background of the program on top - as if they were still in memory.
Another time, upon bootup from sleep mode, vertical lines appeared at the bottom half of the screen for instant. The delayed response began shortly after that.
I have restarted and done a complete shut down of the machine several times.
Last night I did a complete shut down. This morning the problem has gone away!
I'm thinking that the Intel Graphics(R) 5500 is developing a problem.
Any further advice would be helpful.
