•Problem:Allorsomekeysontheexternalnumerickeypaddonotwork.
Solution:Makesurethattheexternalnumerickeypadiscorrectlyconnectedtothecomputer.
Displayandmultimediadevices
Thistopicincludesthemostcommonproblemswithdisplaysandmultimediadevices,includingthe
computerdisplay,theexternalmonitor,audiodevices,andtheopticaldrive.

Computerscreenproblems

•Problem:Thescreenisblank.
Solution:Dothefollowing:
–PressFn+F7tobringuptheimage.
Note:IfyouusetheFn+F7keytoapplyapresentationscheme,pressFn+F7atleastthreetimesin
threeseconds,andtheimageisdisplayedonthecomputerscreen.
–Ifyouareusingtheacpoweradapter ,orusingthebatteryandthebatterystatusindicatorison(is
green),pressFn+F9tomakethescreenbrighter.
–Ifthesleep(standby)statusindicatorison(isgreen),pressFntoresumefromthesleep(standby)mode.
–Iftheproblempersists,dotheSolutionintheproblembelow.
Note:IfyourcomputerisaWindows7model,itdoesnotsupportthepresentationscheme.
•Problem:Thescreenisunreadableordistorted.
Solution:Makesurethat:
–Thedisplaydevicedriverisinstalledcorrectly.
–Thescreenresolutionandcolorqualityarecorrectlyset.
–Themonitortypeiscorrect.
Tocheckthesesettings,doasfollows:
ForWindows7:
1.Right-clickonthedesktop,andclickPersonalize.
2.ClickDisplayattheleft.
3.SelectChangedisplaysettings.Checkwhetherthescreenresolutioniscorrectlyset.
4.ClickAdvancedSettings.
5.ClicktheAdaptertab.
6.Mak esurethatthecorrectdevicedrivernameisshownintheadapterinformationwindow.
Note:Thedevicedrivernamedependsonthevideochipthathasbeeninstalledonyourcomputer.
7.ClickthePropertiesbutton.Ifyouarepromptedforanadministratorpasswordorconrmation,type
thepasswordorprovideconrmation.Checkthe“Devicestatus”boxandmakesurethedeviceis
workingproperly.Ifnot,clicktheTroubleshootbutton.ClosethePropertieswindow .
8.ClicktheMonitortab.Checkwhetherthecolorqualityiscorrectlyset,makesur eotherinformation
isalsocorrect.
9.ClickthePropertiesbutton.Ifyouarepromptedforanadministratorpasswordorconrmation,type
thepasswordorprovideconrmation.Checkthe“Devicestatus”boxandmakesurethedeviceis
workingproperly.Ifnot,clicktheTroubleshootbutton.
ForWindowsXP:
138UserGuide