Dell OptiPlex 990 (Early 2011) - Manual (Page 5)

16 Power Supply..........................................................................................47
Removing The Power Supply ..........................................................................................47
Installing the Power Supply ............................................................................................49
17 System Board..........................................................................................51
Removing The System Board ..........................................................................................51
Installing the System Board ............................................................................................52
18 System Setup..........................................................................................53
System Setup ..................................................................................................................53
Boot Menu .......................................................................................................................53
Boot Menu Enhancements ..............................................................................................53
Timing Key Sequences ....................................................................................................54
Beep Codes and Text Error Messages ............................................................................55
Navigation .......................................................................................................................55
System Setup Options .....................................................................................................55
19 Troubleshooting......................................................................................67
Diagnostic LEDs ..............................................................................................................67
Beep Codes .....................................................................................................................74
Error Messages ...............................................................................................................77
20 Specifications.........................................................................................87
Technical Specifications .................................................................................................87
21 Contacting Dell.......................................................................................97
Contacting Dell ...............................................................................................................97