Power Supply Statement; External Devices - Lenovo 3000 Safety And Warranty Manual

Power supply statement

Never remove the cover on a power supply or any part that has the following label
attached.
Hazardous voltage, current, and energy levels are present inside any component
that has this label attached. There are no serviceable parts inside these
components. If you suspect a problem with one of these parts, contact a service
technician.

External devices

Do not connect or disconnect any external device cables other than USB and 1394
cables while the computer power is on; otherwise, you might damage your
computer. To avoid possible damage to attached devices, wait at least five seconds
after the computer is shut down to disconnect external devices.
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Lenovo 3000 Safety and Warranty Guide
DANGER
CAUTION