Look in your laptop's manual for the combination of keys you need to press to display to an external monitor (click here).
If no joy with that, the laptop's graphics card (or integrated graphics) may be the main stumbling block. It may only work with a graphics card capable of supporting a large/r resolution.
You don't mention the exact model number, but the 27" Hazros I found have a [whopping!] native resolution of 2560 x 1440. G