Toshiba C55a Manual

Check all cables to ensure that they are correctly and firmly attachedto the computer - loose cables can cause signal errors.
Inspect all connecting cables for loose wires and all connectors forloose pins.
Check that your disc media is correctly loaded
Always try to make detailed notes of your observations and keep them in a permanent error log - this helps you to describe your problems to TOSHIBASupport. In addition, if a problem recurs, the log you have made helps to
identify the problem faster....

HardwareIf you cannot find a software problem, you should
then check the setup and configuration of your
hardware. First run through the items in the
preliminary checklist as described previously
then, if you still cannot correct the problem, try to identify the source. The next section provideschecklists for individual components and
peripherals.Before using a peripheral device or application software that is not an authorized TOSHIBA part or product, make sure that the device or softwarecan be used...

Verify that the computer is on by looking at the Power indicator.
If the indicator is glowing, the computer is on. Also, try turning the computer
off and then on.
If you are using an AC adaptor, verify that the computer is receiving power
from the external power source by looking at the  DC IN/Battery indicator. If
the indicator is glowing, the computer is connected to a live external power
source.
The computer does not load advanced options during startup
By holding down one of the following keys during...

Overheating power down
If the processor's temperature reaches an unacceptably high level witheither setting, the computer automatically shuts down to prevent anydamage. In this instance, all unsaved data in memory is lost.
ProblemProcedureComputer shuts
down automatically.Leave the computer off until it reaches room
temperature. If the computer has reached room
temperature and it still does not start, or if it starts
but shuts down quickly, contact TOSHIBA Support.
AC power
If you have trouble...

ProblemProcedureBattery does not
power the computer
as long as expectedIf you frequently recharge a partially charged
battery, the battery might not charge to its full
potential. In these instances, you should fully
discharge the battery and then attempt to charge it
again.Check the  Power saver  option under  Choose or 
customize a power plan  in the Power Options .
Real-Time Clock
ProblemProcedureThe BIOS setting
and system date/
time are lost.The lasting time of the Real-Time Clock (RTC) has run out....

ProblemProcedureNo displayPress the function keys to adjust the display
priority, and to make sure that it is not set for
output to an external monitor.Markings appear on
the computer's
display panel.These marks might have come from contact with
the keyboard and Touch Pad while the display
panel has been closed. Try to remove the marks
by gently wiping the display panel with a clean dry
cloth or, if this fails, with a good quality LCD screen
cleaner. In this latter instance, you should always
follow...

ProblemProcedureYou cannot access a
CD/DVD/Blu-ray
Disc™ in the driveMake sure that the drive’s disc tray is securely closed. Press gently until it clicks into place.
Open the disc tray and make sure that the disc is
properly seated. It should lie flat with the label
facing up.
A foreign object in the disc tray could block laser
light from reading the disc. Make sure that there is
no obstruction. Remove any foreign object.
Check whether the disc is dirty. If it is, wipe it with
a clean cloth dipped in...

Touch PadProblemProcedureThe Touch Pad does
not work.Check the Device Select settings.
Click  Control Panel -> Hardware and Sound ->
Mouse  under Windows System  group in the Apps
view.On-screen pointer
does not respond to
pointing device
operationIn this instance, the system might be busy. Try
moving the mouse again after waiting a short
while.Double-tapping
(Touch Pad) does
not workIn this instance, you should initially try changing
the double-click speed setting within the Mouse
Control utility.
1. To...

USB mouseProblemProcedureOn-screen pointer
does not respond to
mouse operationIn this instance, the system might be busy. Try
moving the mouse again after waiting a short
while.Remove the mouse from the computer and then
reconnect it to a free USB port in order to ensure
that it is firmly attached.Double-clicking does
not workIn this instance, you should initially try changing the double-click speed setting within the Mouse
Control utility.
1. To access this utility, click  Control Panel ->
Hardware and...

ProblemProcedureUSB device does not
workRemove the USB device from the computer and
then reconnect it to a free port in order to ensure that it is firmly attached.
Ensure that any required USB device drivers are
properly installed. To achieve this, you should refer to both the device documentation and the
operating system documentation.
Sleep and Charge function
For more information and settings, refer to the  USB Sleep and Charge
section.
ProblemProcedureI cannot use the
Sleep and Charge
function.Sleep...