Lenovo ThinkCentre M55 User Manual

Symptom Action
The Enhanced Performance USB
Keyboard does not work.
Verify that:
v The computer is turned on.
v The keyboard is securely connected to a USB connector on the front or rear of
the computer.
v No keys are stuck.
If
you cannot correct the problem, have the computer serviced. Refer to the
warranty and safety information that is provided with your computer for a list of
service and support telephone numbers.
The mouse does not work. The
computer does not respond to
the mouse.
Verify that:
v The computer is turned on.
v The mouse is securely connected to a USB connector on the front or rear of the
computer.
v The mouse is clean. Refer to “Cleaning the mouse” on page 58 for further
information.
If
you cannot correct the problem, have the computer serviced. Refer to the
warranty and safety information that is provided with your computer for a list of
service and support telephone numbers.
The operating system will not
start.
Verify that:
v There is no diskette in the diskette drive.
v
The startup sequence includes the device where the operating system resides.
Usually, the operating system is on the hard disk. See “Selecting a startup
device” on page 50 for more information.
If
you cannot correct the problem, have the computer serviced. Refer to the
warranty and safety information that is provided with your computer for a list of
service and support telephone numbers.
The computer beeps multiple
times before the operating
system starts.
Verify that no keys are stuck down.
If you cannot correct the problem, have the computer serviced. Refer to the
warranty and safety information that is provided with your computer for a list of
service and support telephone numbers.
Diagnostic programs
Diagnostic programs are used to test hardware components of your computer and
report operating-system-controlled settings that can cause hardware failures. There
are two diagnostic programs preinstalled on your computer to help you diagnose
problems: PC-Doctor for Windows and PC-Doctor for DOS.
Notes:
1. You can download the latest version of the diagnostic programs from
http://www.lenovo.com/support/. Type your machine type into the Use
Quick Path field and click Go to find the downloadable files that are specific to
your computer.
2. If you are unable to isolate and repair the problem yourself after you run
PC-Doctor for Windows and PC-Doctor for DOS, save and print the log files
created by both diagnostic programs. You will need the log files when you
speak to a Lenovo technical support representative. (The log file created by
PC-Doctor for Windows is automatically saved in C:\PCDR\DETAILED.TXT.)
56 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