Why is it that pretty much every time a CRT monitor is turned on, it requires adjustments? Sometimes it’s only minor (eg move it a few pixels’ worth), and sometimes it is more (eg needs resizing by a couple of dozen pixels).
It’s easier to see if you adjust the screen to be as even and rectangular as possible, and take up as much of the visible real-estate as possible. When you then turn it on later, it might be too big or too small, or even not rectangular. (This may affect color, moire, convergence, etc. settings as well, but I have noticed it specifically with size/centering/shape settings.) The changes often reduce after the monitor has “warmed up” a bit, but it usually still requires some adjustment.
I’ve tried testing to see if I can narrow down the cause. Specifically, I tried turning the monitor off, waiting a bit, then turning it back on to see if it was changed. I also tried leaving the monitor on, but changing the screen resolution to see if it was the video card. Neither test changed anything—it’s likely the monitor, and only manifests when it’s been off for some time/cooled down.
I don’t know if it happens with LCDs as well, but I expect it occurs on either when using an analog source. And, for the record, this is not a monitor-specific issue because I have seen it on numerous monitors of different makes, models, and sizes—though the degree and frequency may vary.
I tried looking it up, but found nothing about what could cause a (analog?) monitor to require adjustments almost every time it is turned on (or even anyone asking about it).