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Sorry I missed the xrandr didnt work and got busy this weekend..

I did some looking this may help..
https://wiki.ubuntu.com/X/Config/Resolution

Specifically
Resetting an out-of-range resolution
If you set a resolution inappropriate for your monitor in the Screen Resolution GUI tool, you can reset it from a terminal by running

You'll want to try this from a TTY
Instead of removing you could change it to a backup, just to be safe...

I played with the xrandr more (as it should work best)...

So I came up with a work around..
You still want to use xrandr -s 1024x768
But yest TTY cant find display so we need to give the system a few seconds and manually switch back to the desktop..

I tested the ability to change resolution from a TTY with this method..

Again boot the PC once its up (log in should just type PW + enter)
Go into TTY1 with CTRL + ALT + F1
Run this command then immediately switch back CRTL + ALT + F7

If 5 seconds isn't long enough add additional seconds as needed... resolution should change automatically..

tried the "sleep 5; xrandr -s 1024x768 -d :0" suggestion  terminal screen came back with "Size 1024x768 not found in available modes"

UPDATE
Compaq-dc7700p-Ultra-slim-Desktop:~$ xrandr -q
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 640 x 480, maximum 640 x 480
default connected 640x480+0+0 0mm x 0mm
  640x480      73.00*

HP-Compaq-dc7700p-Ultra-slim-Desktop:~$ rm ~/.config/monitors.xml
rm:
cannot remove '/home/linuxlite/.config/monitors.xml': No such file or directory

Not sure why 640x480 is the only listed..
You can substitute that resolution to at least bring the desktop back...??..??


It's not going to be pretty but perhaps the GUI will allow the other resolutions..

Switched monitor off - and unplugged for half an hour.
Rebooted - using nomodeset grub edit , F10 and promptly switched off monitor
and let it finish boot.
Had other things to do so left pc booted and running but not logged on , monitor off.
Came back and log on screen was at higher resolution - icons smaller size.
Went into menu/settings/display = default  BUT set as 1024x768 @ 61Hz - Could not change either Hz or rsesolution.

tty1
HP-Compaq-dc7700p-Ultra-slim-Desktop:~$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1024 x 768, maximum 1024 x 768
default connected 1024x768+0+0 0mm x 0mm
  1024x768      61.00*
  800x600      61.00 
  640x480      60.00 

Restart via menu  ( not  via off)
reboots - logon  flash screen  bigger fonts, login  and x/y oscillations again.

tty1 login, poweroff
Reboot, escape key, nomodeset grub alteration, F10, large fonts/icons  back to 640x480.  again can't alter via menu/settings/display.

HP-Compaq-dc7700p-Ultra-slim-Desktop:~$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 640 x 480, maximum 640 x 480
default connected 640x480+0+0 0mm x 0mm
  640x480      73.00*

Round and round we go again

The reason for the problem not identified, even after all the kind efforts of colleagues here on the forum.

HOWEVER, once back  via nomodeset modified grub onto 640x480 resolution I thought I would run menu/settings/install drivers to see what came up, even though I was not aware of any proprietary drivers - there hadn't been in LL2.8 32bit when used on this setup before I had upgraded the RAM .

Behold: some Intel microcode CPU drivers were identified as being available so I loaded them AND  afterwards ran menu/favourites/install updates but No immediate change to screen resolution.  So rebooted via menu.

Switched off monitor again until boot up activity had settled, switched on monitor and logged in -
RESULT - high resolution screen!!
menu/settings/display showed original iiyama North America 18 inch monitor identified and resolution at 1024x768 x 60Hz.

Updated Hz to 75 without problems - BUT LEFT RESOLUTION ALONE!!!  did not want to fall off the cliff again.

So problem gone away but can't say it has been resolved,  as far from sure what action overcame the problem.

HP-Compaq-dc7700p-Ultra-slim-Desktop:~$ xrandr
Screen 0: minimum 8 x 8, current 1024 x 768, maximum 32767 x 32767
VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 360mm x 290mm
  1600x1200    75.00 
  1280x1024    75.02 
  1152x864      75.00 
  1024x768      75.08*  70.07    60.00 
  832x624      74.55 
  800x600      72.19    75.00    60.32    56.25 
  640x480      75.00    72.81    66.67    60.00 
  720x400      70.08 
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

Suppose I should try and change screen resolution to higher to see whether I can recreate the problem, or it has in fact gone away for good., BUT forgive me if I chicken out of this.  This pc is my main workhorse, and I use the large CRT iiyama as it is a treat to use.; even if a bit quirky.

Again thanks to  Bitsnpcs  and firenice03 for all their good will and effort in support.  Much appreciated.  Shows the spirit of this forum!!

Good to read you have got your monitor working again newtusmaximus

Glad to hear you're back up and running!!!..

;D ;D ;D

Quote:Again thanks to  Bitsnpcs  and firenice03 for all their good will and effort in support.  Much appreciated.  Shows the spirit of this forum!!

- You're Welcome