Lenovo E545 Guide de l'utilisateur Page 118

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Table5.Securitymenuitems(continued)
Menuitem
SubmenuitemSelectionComments
SecureBoot
Disabled
Enabled
EnableordisableUEFI
SecureBootfeature.
Windows8operating
systemrequiresthisfeature
tobeenabled.
PlatformMode
UserMode
SecureBootModeStandardMode
ResettoSetupMode
Yes
No
Thisoptionisusedtoclear
thecurrentplatformkey
andputthesysteminto
setupmode.Youcaninstall
yourownplatformkeyand
customizetheSecureBoot
signaturedatabasesin
setupmode.SecureBoot
modewillbesettocustom
mode.
SecureBoot
RestoreFactorykeysYes
No
Thisoptionisusedto
restoreallkeysand
certicatesinSecure
Bootdatabasestofactory
defaults.Anycustomized
SecureBootsettings
willbeerased,andthe
defaultplatformkeywillbe
re-establishedalongwith
theoriginalsignature
databasesincluding
certicateforWindows
8operatingsystem.
Startupmenu
Youmightneedtochangethestartupsequenceofyourcomputer.Forexample,ifyouhavedifferent
operatingsystemsondifferentdevices,youcanhavethesystemstartupfromeitherofthem.
Attention:Afteryouchangeyourstartupsequence,youmustbeextremelycarefulnottospecifyawrong
deviceduringacopy,asave,oraformatoperation.Ifyouspecifyawrongdevice,yourdataandprograms
mightbeerasedoroverwritten.
Attention:IfyouareusingtheBitLocker
®
driveencryption,youshouldnotchangethestartupsequence.
BitLockerdriveencryptiondetectsthechangeofstartupsequenceandlocksthecomputerfrombooting.
Changingthestartupsequence
SelectingStartuptodisplaytheBootsubmenu.
Tochangethestartupsequence,dothefollowing:
1.SelectBoot;thenpressEnter.
YoucanusetheBootsubmenutospecifythestartupsequencethatrunswhenyouturnonthepower.
Referto“Bootsubmenu”onpage103
.
2.Selectthedeviceyouwanttostartrst.
3.PressFn+F10tosavethechangesandrestartthesystem.
102UserGuide
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