MATSONIC MS7112C Manual page 15

2. The DIMM slots are keyed with notches and the DIMMs are keyed
with cut-outs so that they can only be installed correctly. Check that
the cut-outs on the DIMM module edge connector match the notches
in the DIMM slot.
3. Push the latches on each side of the DIMM slot down.
4. Install the DIMM module into the slot and press it carefully but firmly
down so that it seats correctly. The latches at either side of the slot
will be levered upwards and latch on to the edges of the DIMM when
it is installed correctly.
Check all the Jumper Settings
Check all the mainboard jumpers to ensure that the board is configured
correctly.
A Note on Jumpers
A jumper consists of two or more pins mounted
on the mainboard. Some jumpers might be
arranged in a series with each pair of pins
numbered differently. Jumpers are used to
change the electronic circuits on the mainboard.
When a jumper cap is placed on two jumper
pins, the pins are SHORT. If the jumper cap is
removed (or placed on just a single pin) the
pins are OPEN.
Jumper cap
2-pin jumper
13