Dell Precision 490 Desktop - Manual (Page 30)

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Quick Reference Guide
• Tips and information for using the Microsoft Windows XP operating system
• Instructions for removing and installing parts, including memory, cards, drives, the microprocessor,
and the battery
• Information for troubleshooting various computer problems
• Instructions for using the Dell Diagnostics and reinstalling drivers
• Information on how to contact Dell
You can access the User’s Guide from your hard drive or the Dell Support website at support.dell.com.
Removing the Computer Cover
CAUTION:
Before you begin any of the procedures in this section, follow the safety instructions in the
Product Information Guide.
CAUTION:
To guard against electrical shock, always unplug your computer from the electrical outlet before
removing the cover.
NOTICE:
To prevent static damage to components inside your computer, discharge static electricity from your
body before you touch any of your computer’s electronic components. You can do so by touching an unpainted
metal surface on the computer.
1 Follow the procedures in "Before You Begin" in your User’s Guide.
NOTICE:
Opening the computer cover while the computer is running could result in a shutdown without warning
and a loss of data in open programs. The computer cooling system cannot function properly while the cover
is removed.
2 If you have installed a security cable, remove it from the security cable slot.
NOTICE:
Ensure that sufficient space exists to support the removed cover—at least 30 cm (1 ft) of desk top space.
NOTICE:
Ensure that you are working on a level, protected surface to avoid scratching either the computer or the
surface on which it is resting.
3 Lay your computer on a flat surface with the cover facing up.