Dell OptiPlex 740 User Manual page 208

(FRONTPANEL) (POWER1)
10 CMOS reset jumper 11 battery socket
(RTCRST) (BATTERY)
13 PCI Express x16 14 standby power
connector (SLOT1) (AUX_PWR_LED)
16 PCI Express x1 17 password jumper
connector (SLOT4) (PSWD)
19 floppy drive connector 20 serial connector
(DSKT) (PS2/SER2)
22 fan connector
(FAN_CPU)
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(INTRUDER)
12 internal USB (USB1)
15 PCI connector (SLOT2)
18 PCI connector (SLOT3)
21 Optional DVI-card connector
(DVI_HDR)