Lenovo ThinkCentre M55 User Manual

v Setup Utility program and hard disk drive passwords are not case sensitive
v Not be your name or your user name
v Not be a common word or a common name
v Be significantly different from your previous password
User Password
When a User Password is set, the user is prompted to type a valid password each
time the computer is turned on. The computer cannot be used until a valid
password is typed from the keyboard.
Administrator Password
Setting an Administrator Password deters unauthorized persons from changing
configuration settings. If you are responsible for maintaining the settings of several
computers, you might want to set an Administrator Password.
After you set an Administrator Password, a password prompt is displayed each
time you try to access the Setup Utility program.
If both the user and administrator passwords are set, you can type either
password. However, to change any configuration settings, you must use your
administrator password.
Setting, changing, and deleting a password
To set, change, or delete a password, do the following:
Note: A password can be any combination of up to twelve characters (A- Z, a-z,
and 0-9). See “Password considerations” on page 49 for more information.
1. Start the Setup Utility program (see Chapter 5, “Using the Setup Utility,” on
page 49).
2. From the Setup Utility program menu, select Security.
3. Select Set Passwords. Read the information displayed on the right side of the
screen.
Selecting a startup device
If your computer does not start up (boot) from a device such as the CD-ROM,
diskette, or hard disk as expected, use one of the following procedures to select a
startup device.
Selecting a temporary startup device
Use this procedure to startup from any boot device.
Note: Not all CDs, hard disks, and diskettes are startable (bootable).
1. Turn off your computer.
2. Press and hold the F12 key then turn on the computer. When the Startup
Device Menu appears, release the F12 key.
Note: If you are using a USB keyboard and the Startup Device Menu does not
display using this method, repeatedly press and release the F12 key
rather than leaving it pressed when turning on the computer.
3. Select the desired startup device from the Startup Device Menu and press Enter
to begin.
50 User Guide

Lenovo ThinkCentre M55 Specifications

General

Tcase	61.4 °C
Bus type	FSB
Stepping	R0
Processor cache	2 MB
Processor cores	2
Processor model	E6300
System bus rate	- GT/s
Processor family	Intel® Core™2 Duo
Processor socket	LGA 775 (Socket T)
Processor codename	Conroe
Processing Die size	111 mm²
Processor frequency	1.86 GHz
Processor cache type	L2
Processor lithography	65 nm
Processor manufacturer	Intel
Processor front side bus	1066 MHz
Processor operating modes	64-bit
ECC supported by processor	No
Thermal Design Power (TDP)	65 W
Number of processors installed	1
CPU multiplier (bus/core ratio)	7
Number of Processing Die Transistors	167 M
Audio system	High Definition Audio
Product type	PC
Motherboard chipset	Intel® Q963 Express
Memory slots	2x DIMM
Internal memory	1 GB
Memory clock speed	667 MHz
Internal memory type	DDR2-SDRAM
Maximum internal memory	4 GB
Memory layout (slots x size)	2 x 0.5 GB
HDD speed	7200 RPM
HDD interface	SATA
Optical drive type	DVD-ROM
Total storage capacity	80 GB
Power supply type	AC
Power requirements	120 - 230 V
External drive bays	1 x 5.25\
Internal drive bays	1 x 3.5\
Networking features	Gigabit Ethernet
Intel segment tagging	Enterprise, Professional
Compliance industry standards	IEEE802.3, IEEE802.3u, IEEE802.3ab
On-board graphics card	Yes
Discrete graphics card model	Intel® GMA 3000
Maximum graphics card memory	- GB
Operating system installed	Windows Vista Business
USB 2.0 ports quantity	8
Firewire (IEEE 1394) ports	0
Cabling technology	10/100/1000Base-T(X)
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Power supply	225 W
Chassis type	SFF
Product color	Black
Processor code	SLGW2
Processor ARK ID	27248
Processor package size	37.5 x 37.5 mm

Weight and Dimensions

Depth	358 mm
Width	310 mm
Height	88 mm
Weight	8500 g