Lenovo THINKPAD L420 User Manual

–StartPowerManager.
–ClickthePowerschemetab,andthenselectMaximumPerformancefromthepredenedpower
schemes.
•Problem:WhenIturnonthemachine,nothingappearsonthescreenandthemachinedoesnotbeep
whilestartingup.
Note:Ifyouarenotsurewhetheryouheardanybeeps,turnoffthecomputerbypressingandholding
thepowerswitchfor4secondsormore.Turnitonandlistenagain.
Solution:Makesurethat:
–Thebatteryisinstalledcorrectly.
–Theacpoweradapterisconnectedtothecomputerandthepowercordispluggedintoaworking
electricaloutlet.
–Thecomputeristurnedon.(Turnthepowerswitchonagainforconrmation.)
Ifapower-onpasswordisset:
–Pressanykeytodisplaythepromptforthepower-onpassword.Ifthebrightnesslevelofthescreenis
low,increaseitbypressingtheFn+Home.
–TypethecorrectpasswordandpressEnter(refertoPower-onpassword).
Iftheseitemsareproperlyset,andthescreenremainsblank,havethecomputerserviced.
•Problem:WhenIturnonthemachine,onlyawhitecursorappearsonablankscreen.
Solution:Ifyouhavemodiedapartitiononyourharddiskdrivebyusingapartitionsoftware,information
aboutthatpartition,orthemasterbootrecordmayhavebeendestroyed.
1.Turnoffthecomputer,andthenturnitonagain.
2.Ifyoustillseeonlythecursoronthescreen,dothefollowing:
–Ifyouhaveusedthepartitionsoftware,examinethepartitionontheharddiskdrivebyusingthe
software,andrecoverthepartitionifrequired.
–UseeithertheRescueandRecoverworkspaceortherecoverydiscstorestorethesystemtothe
factorystate.Fordetailsaboutrestoringthesystemtothefactorystate,see“Performingbackup
andrecoveryoperations”onpage83.
Iftheproblempersists,havethecomputerserviced.
•Problem:Myscreengoesblankwhilethecomputerison.
Solution:Yourscreensaverorpowermanagementmaybeenabled.Doeitherofthefollowing:
–MovetheTrackPointorthetouchpad,orpressakeytoexitthescreensaver.
–Pressthepowerswitchtoresumefromsleep(standby)orhibernation.
Memoryproblems
Printtheseinstructionsnowandkeepitwithyourcomputerforreferencelater.
Ifyourmemoryisnotoperatingproperly,checkthefollowingitems:
1.Verifythatthememoryisinstalledandseatedcorrectlyinyourcomputer.
Itmaybenecessarytoremovealladdedmemoriestotestthecomputerwithonlythefactory-installed
memories,andthenreinstallthememoryoneatatimetoensureaproperconnection.Forthe
procedurestoremoveandreinstallamemory,referto“Replacingthememory”onpage91.
2.Checkforerrormessagesduringstartup.
162UserGuide

Lenovo THINKPAD L420 Specifications

General

Bus type	DMI
L3 cache	3 MB
Stepping	J1
Tjunction	100 °C
Processor cores	2
Processor model	i5-2520M
System bus rate	5 GT/s
Processor family	Intel® Core™ i5
Processor series	Intel Core i5-2500 Mobile Series
Processor socket	Socket 988
Processor threads	4
Processor codename	Sandy Bridge
Processor frequency	2.5 GHz
Processor cache type	Smart Cache
Processor lithography	32 nm
Processor manufacturer	Intel
Processor front side bus	- MHz
PCI Express slots version	2.0
Processor boost frequency	3.2 GHz
Processor operating modes	64-bit
ECC supported by processor	No
PCI Express configurations	1x16, 2x8, 1x8+2x4
Thermal Design Power (TDP)	35 W
CPU multiplier (bus/core ratio)	25
Maximum number of PCI Express lanes	16
HDD speed	- RPM
HDD interface	SATA
Optical drive type	DVD-RW
Total storage capacity	320 GB
Number of HDDs installed	1
Display diagonal	14 \
Display resolution	1366 x 768 pixels
Native aspect ratio	16:9
Memory slots	2x SO-DIMM
Internal memory	3 GB
Memory clock speed	1333 MHz
Internal memory type	DDR3-SDRAM
Maximum internal memory	8 GB
Memory layout (slots x size)	1 x 1 + 1 x 2 GB
On-board graphics card	Yes
On-board graphics card ID	0x116
Discrete graphics card model	-
On-board graphics card model	Intel® HD Graphics 3000
On-board graphics card family	Intel® HD Graphics
On-board graphics card base frequency	650 MHz
On-board graphics card dynamic frequency (max)	1300 MHz
Type	PC
Power requirements	100-240V
Compliance industry standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab
Audio system	HD
Speaker power	1.5 W
Pointing device	ThinkPad UltraNav
Cabling technology	10/100/1000Base-T(X)
Networking features	Gigabit Ethernet
Charging port type	DC-in jack
USB 2.0 ports quantity	3
Firewire (IEEE 1394) ports	0
Cable lock slot type	Kensington
Sustainability certificates	ENERGY STAR
Product color	Black
AC adapter power	65 W
Processor code	SR048
Processor ARK ID	52229
Processor package size	37.5 x 37.5 (rPGA988B); 31 x 24 (BGA1023) mm
Supported instruction sets	AVX
Intel Identity Protection Technology version	1.00

Weight and Dimensions

Depth	232.9 mm
Width	343.9 mm
Weight	2300 g
Height (rear)	36 mm
Height (front)	32 mm