Lenovo 2555 Personal Computer User Manual


 
Windows Management Instrumentation (WMI)
Windows Management Instrumentation is a set of extensions to the Windows Driver Model. It provides an
operating system interface through which instrumented components provide information and notication.
Input/Output (I/O) features
9-pin serial port (one standard and one optional)
Four Universal Serial Bus (USB) 2.0 connectors (two on the front panel and two on the rear panel)
Four USB 3.0 connectors
One Ethernet connector
One or more DisplayPort connectors (varies by model)
One DVI connector (varies by model)
One VGA monitor connector
One Personal System/2 (PS/2) keyboard connector (optional)
One PS/2 mouse connector (optional)
Three audio connectors on the rear panel (audio line-in connector, audio line-out connector, and
microphone connector)
Two audio connectors on the front panel (microphone connector and headphone connector)
For more information, see “Locating connectors, controls, and indicators on the front of your computer” on
page 8
and “Locating connectors on the rear of your computer” on page 9.
Expansion
Two hard disk drive bays (one standard and one optional)
Two optical drive bays
Two PCI card slots
One PCI Express x1 card slot
One PCI Express x16 graphics card slot
One card reader drive bay
Power supply
Your computer comes with one of the following types of power supply:
280-watt automatic voltage-sensing power supply
450-watt automatic voltage-sensing power supply
Security features
Computrace Agent software embedded in rmware
Cover presence switch (also called intrusion switch)
Ability to enable or disable a device
Ability to enable and disable USB connectors individually
Keyboard with ngerprint reader (shipped with some models)
Power-on password (POP), administrator password, and hard disk drive password to deter unauthorized
use of your computer
Startup sequence control
Chapter 1. Product overview 3