Win10 Thinks Old 2nd Monitor Is Still Attached

[Seatrendsam6969]

I was using a 2nd monitor with win 10. then I upgraded to a better monitor. now, when I start a program, win10 still thinks the monitor is still attached and starts the program in the old monitor. is there a way to tell a program which monitor to start on?
Thanks!

 

[Trouble]

Have a look in device manager
Right click the start button and choose it from the context menu
Use the menu bar to select "View -> Show hidden devices"
Expand monitors
See what you see and uninstall anything that doesn't look right.
Reboot and see if that helps at all.