Lenovo ThinkCentre E50 -FR - Manual (Page 10)

Locating the connectors on the rear of your computer
The following illustration shows the location of connectors on the rear of the
computer.
1 Power connector 9 Ethernet connector
2 Voltage switch 10 USB connectors
3 Mouse connector 11 Microphone connector
4 Keyboard connector 12 Audio line out connector
5 Serial connector 13 Audio line in connector
6 Parallel connector 14 AGP adapter or PCI Express x16 graphics
adapter connector (some models)
7 VGA monitor connector 15 PCI adapter connectors
8 USB connectors
2 Hardware Replacement Guide