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Dell OptiPlex 780 User Manual Page 44
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8
.
Press
the
release
lever down
and
out
to
release
the
processor
cover.
9
.
Open
the processor
cover.
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2
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...
72
73
Notes, Cautions, and Warnings
1
Working on Your Computer
2
Turning Off Your Computer
3
Removing and Replacing Parts
4
Specifications
5
System Board Layout
8
System Setup
9
System Setup Options
10
Boot Sequence
14
Booting to a USB Device
15
Password Protection
15
Assigning a System Password
16
Typing Your System Password
16
Administrator Password
17
Clearing Forgotten Passwords
18
Jumper Settings
18
Clearing CMOS Settings
19
Diagnostics
21
Power Button Light Codes
22
Beep Codes
23
Diagnostic Lights
24
Removing the Cover
26
Replacing the Cover
27
Drive Cage
30
Replacing the Drive Cage
33
Optical Drive
34
Replacing the Optical Drive
35
Removing the WLAN Card
36
Replacing the WLAN Card
38
System Fan
39
Replacing the System Fan
41
Heat Sink and Processor
42
9. Open the processor cover
44
Back to Contents Page
45
Intrusion Switch
46
Coin-Cell Battery
48
System Board
50
Replacing the System Board
53
Front Bezel
54
Replacing the Front Bezel
55
Hard Drive
56
Replacing the Hard Drive
57
Control Panel
58
Replacing the Control Panel
60
Internal Antenna Cable
61
Internal Speaker
64
Removing the Memory Module(s)
66
I/O Panel
68
Replacing the I/O Panel
70
Power Supply
71
Replacing the Power Supply
73
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