Acer Mg43m Motherboard Manual -

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.

You search for the manual, hoping for a detailed schematic of fan headers, overclocking menus, or RGB control. Acer Mg43m Motherboard Manual

Spoiler alert: You aren't going to find it. You have the proprietary PSU that fits it

If you are reading this, you have likely just picked up a used Acer Aspire desktop, or you are trying to resurrect a dusty tower from the back of your office closet. Inside, you spotted the model number MG43M printed on the green PCB. Spoiler alert: You aren't going to find it

Look for a two or three-pin header labeled or "CLR1" . It is usually located near the bottom right corner, next to the front audio header. There is no button. You have to move a jumper cap from pins 1-2 to 2-3 for ten seconds.

This means Acer never intended for you to upgrade it. They intended for you to call their tech support if it broke.