Or, they might indicate a potential safety issue. However, do not take risks or attempt to diagnose the situation yourself.
Frequently inspect your computer and its components for damage or wear or signs of danger. If you have any question about the condition of a component, do not use the product. Contact the Customer Support Center or the product manufacturer for instructions on how to inspect the product and have it repaired, if necessary. For a list of Service and Support phone numbers, see “Worldwide telephone list” on page 72.
In the unlikely event that you notice any of the conditions listed below, or if you have any safety concerns with your product, stop using the product and unplug it from the power source and telecommunication lines until you can speak to the Customer Support Center for further guidance.
vPower cords, plugs, power adapters, extension cords, surge protectors, or power supplies that are cracked, broken or damaged.
vSigns of overheating, smoke, sparks or fire.
vDamage to a battery (such as cracks, dents, creases), discharge from a battery, or a buildup of foreign substances on the battery.
vA cracking, hissing or popping sound, or strong odor that comes from the product.
vSigns that liquid has been spilled or an object has fallen onto the computer product, the power cord or power adapter.
vThe computer product, the power cord or power adapter has been exposed to water.
vThe product has been dropped or damaged in any way.
vThe product does not operate normally when you follow the operating instructions.
Note: If you notice these conditions with a product (such as an extension cord) that is not manufactured for or by Lenovo, stop using that product until you can contact the product manufacturer for further instructions, or until you get a suitable replacement.
General safety guidelines
Always observe the following precautions to reduce the risk of injury and property damage.
Service
Do not attempt to service a product yourself unless instructed to do so by the Customer Support Center. Use only a service provider who is approved to repair your particular product.
viThinkPad® T40 Series Service and Troubleshooting Guide