16 Power Supply

49

Removing The Power Supply

49

Installing The Power Supply

51

17 System Board

53

Removing The System Board

53

Installing The System Board

54

18 Power Supply Unit (PSU) Thermal Sensor

57

Removing The PSU Thermal Sensor

57

Installing The PSU Thermal Sensor

58

19 System Setup

59

System Setup

59

Boot Menu

59

Boot Menu Enhancements

59

Timing Key Sequences

60

Beep Codes and Text Error Messages

61

Navigation

61

System Setup Options

61

20 Troubleshooting

73

Diagnostic LEDs

73

Diagnostic Light Patterns

73

Beep Codes

80

Error Messages

83

Address mark not found

83

Alert! Previous attempts at booting this system have failed at checkpoint

 

[nnnn]. For help in resolving this problem, please note this checkpoint and

 

contact Dell Technical Support

83

Alert! Security override Jumper is installed

84

Attachment failed to respond

84

Bad command or file name

84

Bad error-correction code (ECC) on disk read

84

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Dell 990 service manual System Board, Power Supply Unit PSU Thermal Sensor, System Setup, Troubleshooting