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– The battery is charged.
– The operating temperature is within the acceptable range. Refer to “Operating environment” on page
11.
If the battery is 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 monitor was disconnected or turned off while the computer was
in sleep mode. If you disconnected or turned off the external monitor, 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 monitor or turning it on, and the computer display remains blank, press Fn+F7 to
bring up the computer display.
• Problem: The computer does not return from sleep mode, or the sleep indicator stays on 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 sleep indicator.
– If the sleep indicator is on, your computer is in sleep mode. Connect the ac power adapter to the
computer; then press Fn.
– If the sleep indicator is off, your computer is in hibernation mode or power-off state. Connect the ac
power adapter to the computer; then press the power button to resume operation.
If the system still does not return from sleep mode, your system might stop responding and you might
not be able to turn off the computer. In this case, you need to reset the computer. If you have not
saved your data, it might be lost. To reset the computer, press and hold the power button for 4 seconds
or more. If the system is still not reset, remove the ac power adapter and reset the system by inserting
a straightened paper clip into the emergency reset hole. To locate the emergency reset hole, refer
to “Bottom view” on page 5
• Problem: Your computer does not enter sleep or hibernation mode.
Solution: Check whether any option has been selected to disable your computer from entering sleep
or hibernation mode.
If your computer tries to enter sleep mode but the request is rejected, the device attached to the USB
connector might have been disabled. If this occurs, do a hot-unplug-and-plug operation for the USB
device.
• Problem: The battery discharges slightly while the computer is in hibernation mode.
Solution: If the wakeup function is enabled, the computer consumes a small amount of power. This is not
a defect. For details, refer to “Understanding the power-saving modes” on page 28.
Solid state drive problems
Problem: When you compress les or folders by use of the data compression function in Windows, and then
decompress them, the process of writing to or reading from the les or folders is slow.
Solution: Apply the disk defragmentation tool in Windows for faster access to the data.
98 User Guide