How to fix the input timing issue for DELL monitor?

I have Debian Bullseye and connect DELL monitor with a ASUS server board. Accidentally, I changed the setting for display then after reboot I got " "The current input timing is not supported by the monitor display. "Please change your input timing to 1280x1024 @ 60Hz". Now I can't get into GUI mode. How can I fix it?

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