Dell OptiPlex GX280 - Manual (Page 121)

4 internal speaker (SPEAKER) 17 diagnostic lights (DIAG LED)
5 CD/DVD drive connector (IDE) 18 serial port connector (SER1) and video
connector (VGA)
6 front-panel connector (FRONTPANEL) 19 parallel port connector (PAR)
7 serial ATA drive 0 connector (SATA0) 20 power connector (12VPOWER)
8 standby power light (AUX_PWR) 21 processor and heat-sink connector (CPU)
9 memory module connectors (DIMM1 and DIMM2) 22 heat sink/blower retention pad
10 PCI Express x16 connector (PEG) 23 serial port 2 connector (SER_PS2)
11 PCI riser connector (PCI) 24 fan connector (FAN)
12 CD drive analog audio cable connector for optional analog audio
cable (CD_IN)
25 password jumper (PSWD)
13 front-panel audio cable connector (FRONTAUDIO) 26 power connector (POWER)
Small Desktop System Board
1 RTC reset jumper (RTCRST) 14 front-panel audio cable connector
(FRONTAUDIO)