Couple of things to check:

Look on the back where the VGA cable or connector is in case there is an impedance (Ohms loading) switch, if there is try the other setting.

Check the menu for a Zonal Focus adjustment, or a Moire adjustment (which actually trims the focus slightly, & may be set too far).

But certainly, as mentioned, a monitor's focus potentiometer can be jarred out of position by being transported.