Lenovo ThinkCentre E50 -FR - Manual (Page 14)

The following illustration shows the locations of parts on the system board for
some models.
1 Microprocessor and heat sink 10 SATA connectors (2) (some models)
2 Microprocessor fan connector 11 Front panel connector
3 Memory connector 1 12 Clear CMOS/Recovery jumper
4 Memory connector 2 13 Front USB connectors (2)
5 Power connector 14 Battery
6 Diskette drive connector 15 PCI adapter connectors
7 Primary IDE connector 16 Front audio connector
8 Secondary IDE connector 17 AGP adapter connector
9 System fan connector 18 12v power connector
6 Hardware Replacement Guide