Lenovo ThinkCentre M55 User Manual

5. Install the new battery.
6. Reinstall the PCI riser assembly if removed.
7. Close the computer cover, and connect the cables. See “Closing the cover and
connecting the cables” on page 39.
Note: When the computer is turned on for the first time after battery
replacement, an error message might be displayed. This is normal after
replacing the battery.
8. Turn on the computer and all attached devices.
9. Use the Setup Utility program to set the date and time and any passwords. See
Chapter 5, “Using the Setup Utility,” on page 49.
Erasing a lost or forgotten password (clearing CMOS)
This section applies to lost or forgotten passwords. For more information about
lost or forgotten passwords, go to the ThinkVantage Productivity Center.
To erase a forgotten password:
1. Open the computer cover. See“Opening the cover” on page 21.
2. Locate the Clear CMOS/Recovery jumper on the system board. See
“Identifying parts on the system board” on page 23.
3. Move the jumper from the standard position (pins 1 and 2) to the maintenance
or configure position (pins 2 and 3).
4. Lower the drive bay assembly and reconnect any cables that were
disconnected.
5. Close the computer cover and connect the power cord. See “Closing the cover
and connecting the cables” on page 39.
6. Restart the computer, leave it on for approximately 10 seconds. Turn off the
computer by holding the power switch for approximately 5 seconds. The
computer will turn off.
7. Repeat steps 1 and 2 on page 38.
8. Move the Clear CMOS/Recovery jumper back to the standard position (pins 1
and 2).
9. Close the computer cover and connect the power cord. See “Closing the cover
and connecting the cables” on page 39.
38 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