Lenovo NetVista A20 (English) User guide - Page 103

Solving hardware and software problems, Table 1: Hardware problems

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Solving hardware and software problems Solving hardware problems Table 1: Hardware problems If the problem is: Screen is black (no error code); beep during power on self-test (POST). Error code (and description), more than one beep in self-test, or continuous beep occurs Computer turns off without warning Here's what to do: If you installed memory modules or adapter cards, make sure you installed them correctly. For instructions on installing memory modules on your system board, see "Installing memory modules" on page 7-5. For instructions on installing adapter cards in your system unit, see "Adding and removing adapter cards for desktop model" on page 6-4 and "Adding and removing adapter cards for microtower model" on page 6-6. If an error code or message appears, refer to the section "Error codes and messages" on page 8-17. 1. If mouse movement wakes the monitor, your monitor was in standby. 2. If computer power on light is blinking, your system is in Standby mode. Press the power on button to take the system out of Standby mode. 3. Make sure that the system unit and monitor power cords are securely plugged into electrical outlets. 4. Make sure that the cables are correctly and securely connected to the system unit. 5. Check for a blown fuse, tripped circuit breaker, or power failure. 6. Unplug the system unit power cord from the electrical outlet, wait 10 seconds, and then plug the power cord back into the electrical outlet. If the computer does not start immediately, push the power button on the system unit. 7. If you have added hardware inside the system unit, make sure the power cable connectors are securely attached. Diagnosing and recovering from problems 8-7

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Diagnosing and recovering from problems
8-7
Solving hardware and software problems
Solving hardware problems
Table 1: Hardware problems
If the problem is:
Here's what to do:
Screen is black (no error
code); beep during power
on self-test (POST).
If you installed memory modules or adapter cards, make
sure you installed them correctly. For instructions on
installing memory modules on your system board, see
“Installing memory modules” on page 7-5. For instructions
on installing adapter cards in your system unit, see “Adding
and removing adapter cards for desktop model” on page 6-4
and “Adding and removing adapter cards for microtower
model” on page 6-6.
Error code (and
description), more than
one beep in self-test, or
continuous beep occurs
If an error code or message appears, refer to the section
“Error codes and messages” on page 8-17.
Computer turns off without
warning
1. If mouse movement wakes the monitor, your monitor
was in standby.
2. If computer power on light is blinking, your system is in
Standby mode. Press the power on button to take the
system out of Standby mode.
3. Make sure that the system unit and monitor power
cords are securely plugged into electrical outlets.
4. Make sure that the cables are correctly and securely
connected to the system unit.
5. Check for a blown fuse, tripped circuit breaker, or
power failure.
6. Unplug the system unit power cord from the electrical
outlet, wait 10 seconds, and then plug the power cord
back into the electrical outlet. If the computer does not
start immediately, push the power button on the
system unit.
7. If you have added hardware inside the system unit,
make sure the power cable connectors are securely
attached.