I'm sorry about the issue. What's the exact model of your new Acer FHD 1080P, such as K242HL or H213H, etc.?
Do you have the manual for the new monitor?
Are you able to go to Control Panel in Windows, then adjust the display / screen resolution there?
Can we do a remote support session, so I can troubleshoot the issue directly on your computer together with you?
Please reply at the box below. Thank you,