Thank you for your reply & suggestion. Looking back on it, a year and a half ago, nothing fixed the problem that I could attempt remotely. When I got back home, I realized two different things may have caused the problem. First, I had the monitor powered off. When the PC would reboot remotely, it couldn’t detect my large monitor, so it probably reverted to 640x480. Second, I had my video card not only connected to my monitor, but also via a cable to my TV, and that may have contributed to the problem. When I disconnected that (TV) cable and powered on the monitor, the resolution went back to what it should have been after a reboot. So, this past January, before I left, I did several things. I disconnected the TV cable. I turned off all screen savers and monitor power-saver options. And this is key, I left the monitor powered on. In addition to all that, I also wanted to be able to remotely power down the PC and then power it back on, so I could get a clean boot if ever needed. I used a Kasa remotely controllable plug, and modified the BIOS that if there was a power failure (i.e., when I remotely “unplugged” my PC), upon power restoration, the PC would automatically power on and boot. And lastly, I installed a remotely controllable camera in front of the monitor so I could see what was really being displayed, if the problem should ever reappear. The problem did not reappear with these precautions.
