You search for the manual, hoping for a detailed schematic of fan headers, overclocking menus, or RGB control.
You have the proprietary PSU that fits it (Acer often uses non-standard 12-pin power). Replace it if: You want to use a standard case, standard fans, or overclocking. Acer Mg43m Motherboard Manual
The manual won't show you a photo of this. You just have to hunt for it with a flashlight. The MG43M is fine for a retro Windows 7 build or a basic office PC. It usually pairs with an Intel H61 or H67 chipset (check the large chip under the heatsink). You search for the manual, hoping for a