Lenovo ThinkCentre A58, Manual

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DANGER
Laser radiation when open. Do not stare into the beam, do not view
directly with optical instruments, and avoid direct exposure to the beam.
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.
Products with television tuner options installed
The notice below applies to products containing television (TV) tuner devices
that connect to external antennas or to cable/CATV systems, or both, and that
are intended to be installed in North America. Users and installers in other
countries should follow local codes and ordinances when installing appliances
that connect to external antennas and cable/CATV systems. If local codes are
not applicable, it is recommended that users/installers follow guidelines
similar to those that follow.
Note to CATV system installer
This reminder is provided to call the CATV system installer's attention to
Article 820-40 of the National Electrical Code (NEC) that provides guidelines
for proper grounding and, in particular, specifies that the cable ground shall be
connected to the grounding system of the building, as close as possible to the
point of cable entry as practical.
Chapter 1. Important safety information
11