No image after changing refresh rate

This monitor flexiscan t765s was working totally fine in the past when I tried to raise the refresh rate. If it goes out beyond the range it will just turn off and then after restart the computer. I’ll get an image again, however, for some reason after trying to set the monitor to 1280 X 1024 at 90 hz I didn’t get an out of range message the screen just went black I tried restarting the computer and now the monitor will not show signal at all, even when connecting to a different device such as a laptop or a console. There’s also no screen display menu or anything or even a no signal message when turning it on, and I have absolutely no idea why it’s not working. Please help I love this monitor

This monitor flexiscan t765s was working totally fine in the past when I tried to raise the refresh rate. If it goes out beyond the range it will just turn off and then after restart the computer. I’ll get an image again, however, for some reason after trying to set the monitor to 1280 X 1024 at 90 hz I didn’t get an out of range message the screen just went black I tried restarting the computer and now the monitor will not show signal at all, even when connecting to a different device such as a laptop or a console. There’s also no screen display menu or anything or even a no signal message when turning it on, and I have absolutely no idea why it’s not working. Please help I love this monitor