If it shows up before Windows loads, it's a hardware problem. Run a screen diagnostic (hold D through powerup). Do the test screens show up OK?
If yes, check the cable that runs between the mainboard and display panel for damage. If it's intact, chances are the GPU is on its way out -- replace the mainboard.
If the cable is damaged, replace it and that should solve the problem.
If the same fault shows on the setup screen, during the diagnostics and under Windows -- replace the display panel (and you may want to replace the display wiring harness as well while you've got the system apart).
When I run the startup screen diagnostic I see several screens flashing (blue gray red and green) but the pulsing is present and there are horizontal lines at the top and a textured background ... so I'm not entirely sure of what I'm looking at. After a 10 or 15 seconds the computer powers off.
Based on your suggestions I pushed the screen back and forth on its hinges a handful of times and the problem went away. So your diagnosis looks correct. I may just replace the harness to start since it's a cheap item. We'll see.
ejn63
10 Elder
•
30.7K Posts
1
April 18th, 2021 06:00
If it shows up before Windows loads, it's a hardware problem. Run a screen diagnostic (hold D through powerup). Do the test screens show up OK?
If yes, check the cable that runs between the mainboard and display panel for damage. If it's intact, chances are the GPU is on its way out -- replace the mainboard.
If the cable is damaged, replace it and that should solve the problem.
ejn63
10 Elder
•
30.7K Posts
1
April 18th, 2021 07:00
If the same fault shows on the setup screen, during the diagnostics and under Windows -- replace the display panel (and you may want to replace the display wiring harness as well while you've got the system apart).
TommyLunchBucket
3 Posts
0
April 18th, 2021 07:00
Thanks for responding....
When I run the startup screen diagnostic I see several screens flashing (blue gray red and green) but the pulsing is present and there are horizontal lines at the top and a textured background ... so I'm not entirely sure of what I'm looking at. After a 10 or 15 seconds the computer powers off.
TommyLunchBucket
3 Posts
0
April 18th, 2021 09:00
Based on your suggestions I pushed the screen back and forth on its hinges a handful of times and the problem went away. So your diagnosis looks correct. I may just replace the harness to start since it's a cheap item. We'll see.
Regardless I really appreciate your help!