Additional information ...................................................................................................................................... 135
viii
Slow performance ......................................................................................................... 111
Display ............................................................................................................................................. 112
Display anomalies ......................................................................................................... 112
Symptom .................................................................................................... 112
Quick check ................................................................................................. 113
Dead pixel ..................................................................................................................... 115
No video (internal) ........................................................................................................ 115
No video (external) ....................................................................................................... 116
DisplayPort/VGA ........................................................................................................... 116
HDMI .............................................................................................................................. 116
Touch screen ................................................................................................................. 118
I/O devices ....................................................................................................................................... 119
Keyboard ....................................................................................................................... 119
Keyboard point stick ..................................................................................................... 120
Keyboard backlight ....................................................................................................... 120
TouchPad ....................................................................................................................... 121
USB ................................................................................................................................ 123
Smart card reader ......................................................................................................... 124
Thunderbolt (TB) ........................................................................................................... 126
Storage ............................................................................................................................................ 127
Read-write error ........................................................................................................... 129
Slow performance ......................................................................................................... 129
Blue screen (BSOD) error .............................................................................................. 129
Noisy hard drive ............................................................................................................ 130
Mechanical ....................................................................................................................................... 131
Fan error message - 90B .............................................................................................. 131
Noise (sound) ................................................................................................................ 132
Fan runs constantly ...................................................................................................... 133
Thermal shutdown (hot) ............................................................................................... 134
Stuck power button ...................................................................................................... 134