Astroman, thanks for your insight on this issue. Here’s what I’ve tried so far:
-Select different resolution in monitor control panel, reboot, select original resolution in monitor control panel, reboot.
-Select different switch setting in adapter (1267), reboot, select original switch setting (2367), reboot.
In both cases, the dots are still present.
In cases where there is no display at all, the computer’s manual suggests resetting the PRAM and NVRAM with these steps:
• Turn on
• At the startup sound, press and hold Command Option P R
• When the startup sound repeats twice, release keys, and press and hold Shift
• Release key when “Extensions Off” appears
• Open Systems folder, open Preferences folder, drag Display Preferences to Trash.
• Restart.
I tried this, but no change.
I understand this computer has a CUDA switch which can be reset. Do you think this is worth a try? I read somewhere online it’s necessary to hold this switch down for 20 seconds, but I wanted to get another opinion before I try it.
Would it be worth a try to reseat the RAM and video RAM sticks?
Thanks for your help! I’m not ready to give up!
Marty