Troubleshooting and Maintenance 27
Power
Symptom Possible solution
Error message: Invalid
system disk or
Non-System disk or
Disk error.
When optical disc drive activity stops, remove the disc and
press the spacebar on the keyboard. The computer should
start up.
Computer does not turn
off when the On button
is pressed.
Press and hold the On button until the computer turns off.
Check power settings.
Computer shuts down
automatically.
The computer may be in an exceedingly hot environment. Let it
cool down.
Ensure computer air vents are not blocked and internal fan is
running. Note that your computer may not have an internal fan.
Display
Symptom Possible solution
Screen is blank, and
power light is not lit.
Reconnect the power plug to the back of the computer and to
the wall outlet.
Press the On button on the front of the computer.
Screen is blank. Press the space bar on the keyboard or move the mouse to
make the screen display visible again.
Press the Esc key on the keyboard to resume from Sleep or
Hibernate mode.
Press the On button to turn on the computer.
Images on the screen
are too large or too
small, or the images are
fuzzy.
Adjust the monitor resolution setting in Windows 7:
1 Click the Start button, and then click Control Panel.
2 Under Appearance and Personalization, click Adjust
Screen Resolution.
3 Adjust resolution as necessary, and then click Apply.
Keyboard and mouse (with cable)
Symptom Possible solution
Keyboard commands
and typing are not
recognized by the
computer.
Turn off the computer by using the mouse, unplug and
reconnect the keyboard to the back of your computer, and then
turn on your computer.
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