User manual Dell 990

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Working on Your Computer  
Before Working Inside Your Computer  
Use the following safety guidelines to help protect your computer from potential damage  
and to help to ensure your personal safety. Unless otherwise noted, each procedure  
included in this document assumes that the following conditions exist:  
You have read the safety information that shipped with your computer.  
A component can be replaced or--if purchased separately--installed by  
performing the removal procedure in reverse order.  
WARNING: Before working inside your computer, read the safety information that  
shipped with your computer. For additional safety best practices information, see  
the Regulatory Compliance Homepage at  
CAUTION: Many repairs may only be done by a certified service technician. You  
should only perform troubleshooting and simple repairs as authorized in your  
product documentation, or as directed by the online or telephone service and  
support team. Damage due to servicing that is not authorized by Dell is not covered  
by your warranty. Read and follow the safety instructions that came with the  
CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist  
grounding strap or by periodically touching an unpainted metal surface, such as a  
connector on the back of the computer.  
CAUTION: Handle components and cards with care. Do not touch the components  
or contacts on a card. Hold a card by its edges or by its metal mounting bracket.  
Hold a component such as a processor by its edges, not by its pins.  
CAUTION: When you disconnect a cable, pull on its connector or on its pull-tab, not  
on the cable itself. Some cables have connectors with locking tabs; if you are  
disconnecting this type of cable, press in on the locking tabs before you disconnect  
the cable. As you pull connectors apart, keep them evenly aligned to avoid bending  
any connector pins. Also, before you connect a cable, ensure that both connectors  
are correctly oriented and aligned.  

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