4Fanlouvers(rear)
Theinternalfanandlouversenableairtocirculateinthecomputerandcoolthecentralprocessor.
Note:T oavoidimpedingairow,donotplaceanyobstacleinfrontofthefan.
Statusindicators
Thestatusindicat orsshowthecurrentstatusofyourcomputer.

System-statusindicators

1DeviceAccess
Aharddiskdriveoranoptionaldrive,suchasadriveintheUltrabay,isbeingusedtoreadorwritedata.
Whenthisindicatorisblinking,donotputthecomputerintosleep(standby)mode,removethe
devicefromthebay,orturnoffthecomputer.
2PowerOn
Thepowerswitchstayslitwheneverthecomputerison,blinkswhenthecomputerisinsleep(standby)
mode,andisoffwhenthecomputerisoff.
3CapsL ock
CapsLockmodeisenabled.Y oucanenterallalphabeticcharacters(A-Z)inuppercasewithoutpressing
theShiftkey.
4Numericlock
Bydefault,whenthenumericlockison,thenumericlockindicatorisdisplayedonthescreen.Tochangethe
settingsofthenumericlockindicator,see“Changingdisplaysettings”onpage69.
Note:Anothermodeavailableforyourcomputer,thoughthereisnoindicatorforit,isScrollLockmode.
Whenthismodeisenabled,thearrowkeyscanbeusedasfunctionkeysforscreen-scrolling,butnotfor
Chapter1.ProductOverview11