Dell E521 Owner's Manual - Page 109

Connectors, Controls and Lights, PCI Express x1 - boot to usb

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Connectors External connectors: Video Network adapter USB Audio System board connectors: Serial ATA Internal USB device Floppy drive Fan PCI 2.3 PCI Express x1 PCI Express x16 Front panel Processor Memory Power 12V Power Controls and Lights Front of computer: Power button Power light Diagnostic lights Standby power light Hard-drive activity light 15-hole connector RJ-45 connector two front-panel and four back-panel USB 2.0-compliant connectors six connectors for 7.1 support four 7-pin connectors one 10-pin connector (supports two USB ports) one 34-pin connector one 5-pin connectors two 124-pin connectors one 36-pin connector one 164-pin connector one 40-pin connector one 940-pin connector four 240-pin connectors one 4-pin connector one 24-pin connector push button green light - Blinking green in sleep state; solid green for poweron 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 Problems" on page 43). four lights on the front panel (see "Diagnostic Lights" on page 49.) AUX_PWR_LED on the system board green light - When the computer is reading data from or writing data to the hard drive. Appendix 109

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Appendix
109
Connectors
External connectors:
Video
15-hole connector
Network adapter
RJ-45 connector
USB
two front-panel and four back-panel USB 2.0-compliant
connectors
Audio
six connectors for 7.1 support
System board connectors:
Serial ATA
four 7-pin connectors
Internal USB device
one 10-pin connector (supports two USB ports)
Floppy drive
one 34-pin connector
Fan
one 5-pin connectors
PCI 2.3
two 124-pin connectors
PCI Express x1
one 36-pin connector
PCI Express x16
one 164-pin connector
Front panel
one 40-pin connector
Processor
one 940-pin connector
Memory
four 240-pin connectors
Power 12V
one 4-pin connector
Power
one 24-pin connector
Controls and Lights
Front of computer:
Power button
push button
Power light
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 Problems" on page 43).
Diagnostic lights
four lights on the front panel (see "Diagnostic Lights" on page 49.)
Standby power light
AUX_PWR_LED on the system board
Hard-drive activity light
green light — When the computer is reading data from or writing
data to the hard drive.