Lenovo ThinkCentre Edge 91 - Chapter 9. Preventing problems; Keeping your computer current

Message/SymptomFRU/Action
Serialorparallelportdevicefailure(adapterport)1.ExternalDeviceSelf-TestOK?
2.ExternalDevice
3.Cable
4.AlternateAdapter
5.SystemBoard
Someorallkeysonthekeyboarddonotwork
1.Keyboard
2.KeyboardCable
3.SystemBoard
Undeterminedproblems
Ifyouencounterundeterminedproblems,dothefollowing:
1.Turnoffthecomputerandthepower.
2.Removeordisconnectthefollowingcomponents(ifinstalled)oneatatime.
a.Externaldevices(modem,printer,ormouse)
b.Anyadaptercards
c.Memorymodules
d.Extendedvideomemory
e.ExternalCache
f.ExternalCacheRAM
g.Harddiskdrive
h.Diskettedrive
3.Turnonthepowerandthecomputertore-testthesystem.
4.Repeatsteps1through3untilyoundthefailingdeviceoradaptercards.
Ifalldevicesandadaptercards
havebeenremoved,andtheproblemcontinues,replacethesystemboard.See“Replacingthesystem
board”onpage98
or“Replacingthesystemboard”onpage136.
Chapter7.Symptom-to-FRUindex71