Ensure that you are following the memory installation guidelines (see “Installing Memory” in your Service Manual).

Ensure that the memory you are using is supported by your computer. For more information about the type of memory supported by your computer, see your Service Manual.

Run the Dell Diagnostics (see "Dell Diagnostics" on page 79).

Network Problems

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

C H E C K T H E N E T W O R K C A B L E C O N N E C T O R Ensure that the network cable is

firmly inserted into the network connector on the back of the computer and the network jack.

C H E C K T H E N E T W O R K L I G H T S If the link integrity light is off (see "Network Connector (RJ-45)" on page 27), no network communication is occurring. Replace the network cable.

R E S T A R T T H E C O M P U T E R A N D L O G O N T O T H E N E T W O R K A G A I N

C H E C K Y O U R N E T W O R K S E T T I N G S Contact your network administrator or the person who set up your network to verify that your network settings are correct and that the network is functioning.

R U N T H E H A R D W A R E TR O U B L E S H O O T E R See "Hardware and Software

Problems" on page 110.

Power Problems

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

I F T H E P O W E R L I G H T I S G R E E N A N D T H E C O M P U T E R I S N O T R E S P O N D I N G See

"Diagnostic Lights" on page 73.

I F T H E P O W E R L I G H T I S B L I N K I N G G R E E N The computer is in standby mode.

Press a key on the keyboard, move the mouse, or press the power button to resume normal operation.

I F T H E P O W E R L I G H T I S O F F The computer is either turned off or is not receiving power.

Reseat the power cable in the power connector on the back of the computer and the electrical outlet.

Troubleshooting

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Dell 1200 owner manual Network Problems, Power Problems