ThinkPad P50 User Manual page 120

Solution: Turn off the computer by pressing and holding the power button for four seconds or more. If the
system is still not reset, remove the ac power adapter and reset the system by inserting one end of a needle
or a straightened paper clip into the emergency-reset hole. To locate the emergency-reset hole, refer to
"Bottom view" on page 7.
Boot problems
Print these instructions now and keep them with your computer for reference later.
If you receive an error message before the operating system loads, follow the appropriate corrective actions
for power-on self-test (POST) error messages. See "Error messages" on page 89.
If you receive an error message while the operating system is loading the desktop configuration after the
POST is completed, check the following items:
1. Go to the Lenovo Support Web site at
2. Go to the Microsoft Knowledge Base home page at
message.
Sleep and hibernation problems
• Problem: The computer enters sleep mode unexpectedly.
Solution: If the microprocessor overheats, the computer automatically enters sleep mode to allow the
computer to cool and to protect the microprocessor and other internal components. Check the settings
for sleep mode.
• Problem: The computer enters sleep mode immediately after the power-on self-test.
Solution: Ensure that:
– The batteries are charged.
– The operating temperature is within the acceptable range. Refer to "Operating environment" on page
14.
If the batteries are charged and the temperature is within range, have the computer serviced.
• Problem: A critical low-battery error occurs, and the computer immediately turns off.
Solution: The battery power is getting low. Connect the ac power adapter to the computer and plug it into
an electrical outlet.
• Problem: The computer display remains blank after you press Fn to return from sleep mode.
Solution: Check whether an external display was disconnected or turned off while the computer was in
sleep mode. If you disconnected or turned off the external display, connect it or turn it on before resuming
the computer from the sleep mode. When resuming the computer from the sleep mode without attaching
the external display or turning it on, and the computer display remains blank, press F6 to bring up the
computer display.
• Problem: The computer does not return from sleep mode, or the system-status indicator (illuminated
ThinkPad logo) blinks slowly and the computer does not work.
Solution: If the system does not return from sleep mode, it might have entered sleep or hibernation mode
automatically because the battery is depleted. Check the system-status indicator (illuminated ThinkPad
logo).
– If the system-status indicator (illuminated ThinkPad logo) blinks slowly, your computer is in sleep mode.
Connect the ac power adapter to the computer; then press Fn.
– If the system-status indicator (illuminated ThinkPad logo) is off, your computer is in power-off state or in
hibernation mode. Connect the ac power adapter to the computer; then press the power button to
resume operation.
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P50 User Guide
http://www.lenovo.com/support
http://support.microsoft.com/
and search for the error message.
and search for the error