Lenovo ThinkCentre A30 Quick Reference Manual page 30

4. Connect the monitor cable to the monitor connector on the computer.
v If you have a Standard Video Graphics Array (SVGA) monitor, connect
the cable to the connector as shown.
Note: If your model has two monitor connectors, be sure to use the
connector on the accelerated graphics port (AGP) adapter.
v If you have a digital video interface (DVI) monitor, connect the cable to
the connector as shown.
Note: Your computer must have an adapter installed that supports the
DVI monitor.