DELL NT499 ユーザーズマニュアル

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Adding and Replacing Parts
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5 Connect your computer and devices to electrical outlets, and then turn 
them on.
Resetting the Chassis Intrusion Detector
Enter System Setup (see "Entering System Setup" on page 81).
2 Use the up- or down-arrow keys to highlight the Chassis Intrusion menu 
option, then press <Enter>.
3 Use the left- or right-arrow keys to select Reset.
4 Change the setting to On, On-Silent, or Off.
 
NOTE: 
The default setting is On-Silent.
5 Press <Esc>.
6 Press the left- and right-arrow keys to highlight Save/Exit, and then press 
<Enter> to exit System Setup and restart your computer.
Memory
For information on the type of memory supported by your computer, see 
"Specifications" on page 31. 
 
NOTICE: 
Before you install new memory modules, download the most recent BIOS 
for your computer from support.dell.com.
Memory Overview
Memory modules should be installed in pairs of matched memory size, 
speed, and technology. If the memory modules are not installed in matched 
pairs, the computer will continue to operate, but with a slight reduction in 
performance. See the label in the upper-right corner of the module to 
determine the module’s capacity.