Shows color screen than looks like disconnected from screen

I have my raspberry pi 4 plugged into a Anker surge protector (same thing happens without the surge protector) with this old Acer monitor that I had around, when it boots it will get to the color screen than disconnect, the monitor says no signal, raspberry pi worked on a TV but refuses to work with the monitor. I plugged an old Roku Stick into the monitor and it works. Any idea why my raspberry pi doesn't work with the monitor? Model number for the monitor is S231HL