to identify front panel headers (power, reset, LEDs), which are often the most difficult part of repurposing OEM boards.
Since you lack a true manual, here is the default configuration for the front panel header (JFP1) and CMOS jumper. acer h81h3am v10 manual
for video, along with a mix of USB 3.0 (blue) and USB 2.0 ports. : It provides SATA III (6Gb/s) to identify front panel headers (power, reset, LEDs),