3.TestsandDiagnostics 
SatelliteL550/SatelliteL555/SatelliteL557/SatelliteProL550SeriesT&D
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Mechanicaltypebuttonsx4torelatewithaboveshowed.
BUTTONAPlay/Pausebutton
BUTTONBFR
BUTTONCFF
BUTTONDMute
3.161
st
HDDTest
TheHDDtestallowstheusertoverifythe1stHDDokornot.First,pleaseselectHDDtest
method,Screenwoulddisplayasbelow: