Power Management; Screen Blank Mode; Sleep (Standby) Mode - Lenovo ThinkPad Edge E520 Hardware Maintenance Manual

To remove a user hard disk password that has been forgotten, when the supervisor password and the master
hard disk password are known, do the following:
1. Turn on the computer.
2. When the ThinkPad logo is displayed, immediately press F1 to enter the ThinkPad Setup program.
3. Select Security.
4. Select Password.
5. Select Hard-disk x password, where x is the letter of the hard disk drive. A pop-up window opens.
6. Select Master HDP, where HDP stands for hard disk password.
7. Type the current master hard disk password in the Enter Current Password field. Then, leave the Enter
New Password field blank, and press Enter twice.
8. Press F10 to save changes and exit the ThinkPad Setup program. The user hard disk password and the
master hard disk password have been removed.

Power management

To reduce power consumption, the computer has three power management modes: screen blank, sleep
(standby in Windows XP), and hibernation.

Screen blank mode

To put the computer into screen blank mode, do as follows:
1. Right-click the Power Manager Battery Gauge in the task bar.
2. Select Power off display (keep current power plan) (in Windows XP, keep current power scheme).
To end screen blank mode and resume normal operation, press any key.

Sleep (standby) mode

When the computer enters sleep (standby) mode, the following events occur in addition to what occurs
in screen blank mode:
• The LCD is powered off.
• The hard disk drive is powered off.
• The CPU stops.
If a "suspend time" has been set on the timer, and the user does not do any operation with the keyboard, the
TrackPoint, the hard disk, the parallel connector, or the diskette drive within that time, the computer goes
into sleep (standby) mode automatically.
Note: Even if you do not set the low-battery alarm, the charge indicator notifies you when the battery is low,
and then the computer enters the power-saving mode automatically.
To cause the computer to return from sleep (standby) mode and resume operation, do one of the following:
• Press the Fn key.
• Open the LCD cover.
• Turn on the power switch.
Also, in either of the following events, the computer automatically returns from sleep (standby) mode and
resumes operation:
• The ring indicator (RI) is signaled by a serial device or a PC Card device.
• The time set on the resume timer elapses.
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Hardware Maintenance Manual