Lenovo ThinkPad T420s User Manual

–IfyourcomputerisaWindows7model,itdoesnotsupportthepresentationscheme.
•Problem:Thecomputerdoesnotreturnfromsleep(standby)mode,orthesleep(standby)indicatorstays
onandthecomputerdoesnotwork.
Solution:Ifthesystemdoesnotreturnfromsleep(standby)mode,itmayhaveenteredsleep(standby)or
hibernationmodeautomaticallybecausethebatteryisdepleted.Checkthesleep(standby)indicator.
–Ifthesleep(standby)indicatorison,yourcomputerisinsleep(standby)mode.Connecttheac
poweradaptertothecomputer;thenpressFn.
–Ifthesleep(standby)indicatorisoff,yourcomputerisinhibernationmodeorpower-offstate.Connect
theacpoweradaptertothecomputer;thenpressthepowerbuttontoresumeoperation.
Ifthesystemstilldoesnotreturnfromsleep(standby)mode,yoursystemmaystoprespondingandyou
maynotbeabletoturnoffthecomputer.Inthiscase,youneedtoresetthecomputer.Ifyouhavenot
savedyourdata,itmaybelost.Toresetthecomputer,pressandholdthepowerbuttonfor4secondsor
more.Ifthesystemisstillnotreset,removetheacpoweradapterandthebattery.
•Problem:Yourcomputerdoesnotentersleep(standby)orhibernationmode.
Solution:Checkwhetheranyoptionhasbeenselectedtodisableyourcomputerfromenteringsleep
(standby)orhibernationmode.
Ifyourcomputertriestoentersleep(standby)modebuttherequestisrejected,thedeviceintheUSB
connectormightbedisabled.Ifthisoccurs,doahot-unplug-and-plugoperationfortheUSBdevice.
•Problem:TheFn+F12keycombinationdoesnotmakethecomputerenterhibernationmode.
Solution:Thecomputercannotenterhibernationmode:
–IfthehibernationmodeisnotenabledinWindowsXP.Toenableit,doasfollows:
ForWindowsXP:
1.ClickStart➙Controlpanel.
2.ClickPerformanceandMaintenance.
3.ClickPowerOptions.
4.ClicktheHibernatetab.
5.ClicktheEnablehibernationcheckbox.
6.ClickOK.
IfyouwanttobeabletoenterhibernationmodebypressingFn+F12,youneedtoinstallThinkPad
PMdriver.
•Problem:Thebatterydischargesslightlywhilethecomputerisinhibernationmode.
Solution:Ifthewakeupfunctionisenabled,thecomputerconsumessmallamountofpower.Thisis
notadefect.Fordetails,referto“Power-savingmodes”onpage40
Drivesandotherstoragedevices
Thissectionincludesthreedriveproblemswhichareharddiskdrive,solidstatedrive,andopticaldrive.
Harddiskdriveproblems
•Problem:Theharddiskdrivemakesarattlingnoiseintermittently.
Solution:Therattlingnoisemightbeheard:
–Whentheharddiskdrivebeginsornishesgettingaccesstodata.
–Whenyoucarrytheharddiskdrive.
206UserGuide

Lenovo ThinkPad T420s Specifications

General

RAM	Up to 8GB DDR3
Graphics	Intel HD Graphics 3000 or NVIDIA NVS 4200M
Battery	6-cell Li-ion
Battery Life	Up to 6 hours
Webcam	720p HD
Security	Fingerprint reader, TPM 1.2
Processor	Intel Core i5 or i7 (2nd generation)
Storage	160GB SSD
Display	14-inch HD+ (1600x900) or HD (1366x768)
Operating System	Windows 7 Professional
Ports	VGA, DisplayPort, Ethernet, ExpressCard/34
Wireless	Bluetooth 3.0
Dimensions	340.5mm x 231mm x 21.1-26mm