0. I believe you can try the following suggestions with either the Old CRT or new LCD monitor, but I would start with the Old CRT.
1. Windows Advanced Options Menu. Tap the F8 key about once per second or faster as you power up the system. I'm expecting the following menu to appear:
o Safe Mode
o Safe Mode with Networking
o Safe Mode with Command Prompt
o Enable VGA Mode
o Last Known Good Configuration
o Debugging Mode
o Enable Boot Logging
o Starts Windows Normally
o Reboot
o Return to OS Choices Menu
2. Last Known Good Configuration. Selecting this item will load the registry settings for your last successful login. Not sure if your previous logins to an unsupported display mode count as success. Give it a try. You can use your normal user account with this option.
3. Safe Mode. Per patio's suggestion, try to boot into Safe Mode. You indicated previously that you were stopped by a request for the "Administrator" password. If this is Windows XP Home Edition, it may be "blank", as in never set. Try continuing without entering a password.
If no joy, press CTRL-ALT-DEL to see if a login windows appears that permits you to enter your own username and password. I don't think this is an option but give it a try.
If this is a Windows XP Professional system, try both of the above suggestions.
If you can't get past the password request, Safe Mode may be closed to you.
4. Enable VGA Mode. You can use your normal user account with this mode.
5. If you successfully login with a display you can use, reset the display properties (screen resolution, color depth, refresh rate) to conservative values and reboot normally. Conservative values might be:
o Screen resolution - 800 x 600, 640 x 400
o Color depth - High Color (16-bits), 256 colors (8-bits), 16 bits
o Refresh Rate - ~60 Hz for adapter/monitor/both???
If new settings work for normal boot, you can reset them to the optimal values for your monitor/adapter if you can figure out what that is.
