Toshiba Satellite Pro R50-B - Manual (Page 90)

If you are using the AC adaptor, check that the wall outlet is working by
plugging in another device, such as a lamp.
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.
Hardware and system checklist
This section discusses problems caused by your computer’s hardware or
attached peripherals. Basic problems may occur in the following areas:
Power
Keyboard
Internal display panel
HDD
Optical Disc Drive
Memory Media Card
Pointing Device USB device
Sound system
External monitor
LAN
Wireless LAN
Bluetooth
Power
When the computer is not plugged into an AC power outlet, the battery
pack is the primary power source. However, your computer also has a
number of other power resources, including an intelligent power supply and
a Real Time Clock (RTC) battery, all of which are interrelated with any one
having the ability to produce apparent power problems.
Overheating power down
If the processor's temperature reaches an unacceptably high level with
either setting, the computer will automatically shut down to prevent any
damage - in this instance all unsaved data in memory will be lost.
Problem Procedure
Computer shuts
down automatically. Leave the computer off until the 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.
User's Manual 6-4