serial ATA drives, floppy drive, Media Card Reader, DVD drive, and DVD/CD-RW combo drive
two 3.5-inch hard-drive bays
Video (external card)
15-pin VGA connector
28-pin DVI connector
two front-panel, six back-panel, and two internal USB 2.0-compliant connectors.
seven back-panel connectors for line-in, line-out, microphone, rear surround, side surround, center/subwoofer Low Frequency Effects (LFE) channel, and S/PDIF; two front-panel connectors for headphones/microphone
System board connectors:
six 7-pin connectors
USB 9-pin header for optional Media Card Reader (3.5-inch bay devices)
three 120-pin connectors
PCI Express x1
PCI Express x4 /x8
PCI Express x16
Thermal sensor 1x2
PS/2 and serial port connector 2x12
Controls and Lights
green light Blinking green in sleep state; solid green for power-on state.
amber light Blinking amber indicates a problem with the power supply inside the computer. If the system cannot boot and there is a solid amber light, this indicates a problem with the system board (see Power Lights).
Hard-drive access light
Link integrity light (on integrated network adapter)
green light A good connection exists between a 10-Mbps network and the computer.
orange light A good connection exists between a 100-Mbps network and the computer.
off (no light) The computer is not detecting a physical connection to the network.
Activity light (on integrated network adapter)
yellow light Blinking indicates activity on the network.