Toshiba Portege M400 Series User Manual page 229

If the AC power light still does not come on, check that the
wall outlet is working properly by plugging in a lamp or other
appliance.
The AC adapter and power cord/cable work correctly,
but the battery will not charge.
The battery does not charge while the computer is consuming
full power. Try turning off the computer.
The battery may not be inserted correctly in the computer.
Turn off the computer, remove the battery, clean the contacts
with a soft dry cloth (if necessary) and replace the battery.
See "Removing the battery from the computer" on page
The battery may be too hot or too cold to charge properly. If
you think this is the probable cause, let the battery reach
room temperature and try again.
If the battery has completely discharged, it will not begin
charging immediately. Leave the AC adapter and power cord/
cable connected, wait 20 minutes and see if the battery is
charging.
If the battery light is glowing after 20 minutes, let the
computer continue charging the battery for at least another 20
minutes before you turn on the computer.
If the battery light does not glow after 20 minutes, the battery
may have reached the end of its useful life. Try replacing it.
The battery appears not to power the computer for as
long as it usually does.
If you frequently recharge a partially charged battery, it may
not charge fully. Let the battery discharge completely, then
try charging it again.
If Something Goes Wrong
Resolving a hardware conflict
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