IBM HS20 Hardware Maintenance Manual - Page 35

Memory errors, Recovering the BIOS code, World Wide Web. Go - bios update

Get IBM HS20 - BladeCenter - 8832 PDF manuals and user guides
UPC - 087944983033
View all IBM HS20 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 35 highlights

Note: Power is available to relight the light path diagnostics LEDs for a short period of time after the blade server is removed from the BladeCenter unit. During that period of time, you can relight the light path diagnostics LEDs for a maximum of 25 seconds (or less, depending on the number of LEDs that are lit and the length of time the blade server is removed from the BladeCenter unit) by pressing the light path diagnostics button. The light path diagnostics power present LED (CR111) lights when the light path diagnostics button is pressed if power is available to relight the blade-error LEDs. If the light path diagnostics power present LED does not light when the light path diagnostics button is pressed, no power is available to light the blade-error LEDs and they will be unable to provide any diagnostic information. Use the table at "Light path diagnostics" on page 75 to help determine the cause of the error and the action you should take. Memory errors If a memory problem occurs, take the following actions before replacing a DIMM: 1. Reseat both DIMMs in the bank. 2. Check for a memory type mismatch in the bank. 3. Run the diagnostic programs. For more information about memory, see "Installing memory modules" on page 40. Recovering the BIOS code If the BIOS code has become damaged, such as from a power failure during a flash update, the blade server may appear to be nonfunctional (no video, no beeps). You can recover the BIOS code using the BIOS code page jumper (J12) and a BIOS flash diskette. Note: To obtain a BIOS flash diskette, download a BIOS flash diskette from the World Wide Web. Go to http://www.ibm.com/pc/support/ and make the selections for your server. The flash memory of the server consists of a primary page and a backup page. The J12 jumper controls which page is used to start the blade server. If the BIOS code in the primary page is damaged, you can use the backup page to start the blade server; then, start the BIOS flash diskette to restore the BIOS code to the primary page. To recover the BIOS code, complete the following steps: 1. Turn off the blade server. 2. Remove the blade server from the BladeCenter unit (see "Removing the blade server from the BladeCenter unit" on page 29). 3. Remove the cover (see "Opening the blade server cover" on page 34). 4. Locate jumper J12 (BIOS code page jumper) on the system board. Chapter 4. Diagnostics 25

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
Note:
Power is available to relight the light path diagnostics LEDs for a short
period of time after the blade server is removed from the BladeCenter unit.
During that period of time, you can relight the light path diagnostics LEDs for
a maximum of 25 seconds (or less, depending on the number of LEDs that
are lit and the length of time the blade server is removed from the
BladeCenter unit) by pressing the light path diagnostics button. The light
path diagnostics power present LED (CR111) lights when the light path
diagnostics button is pressed if power is available to relight the blade-error
LEDs. If the light path diagnostics power present LED does not light when
the light path diagnostics button is pressed, no power is available to light the
blade-error LEDs and they will be unable to provide any diagnostic
information.
Use the table at “Light path diagnostics” on page 75 to help determine the cause of
the error and the action you should take.
Memory errors
If a memory problem occurs, take the following actions before replacing a DIMM:
1.
Reseat both DIMMs in the bank.
2.
Check for a memory type mismatch in the bank.
3.
Run the diagnostic programs.
For more information about memory, see “Installing memory modules” on page 40.
Recovering the BIOS code
If the BIOS code has become damaged, such as from a power failure during a flash
update, the blade server may appear to be nonfunctional (no video, no beeps). You
can recover the BIOS code using the BIOS code page jumper (J12) and a BIOS
flash diskette.
Note:
To obtain a BIOS flash diskette, download a BIOS flash diskette from the
World Wide Web. Go to http://www.ibm.com/pc/support/ and make the
selections for your server.
The flash memory of the server consists of a primary page and a backup page. The
J12 jumper controls which page is used to start the blade server. If the BIOS code
in the primary page is damaged, you can use the backup page to start the blade
server; then, start the BIOS flash diskette to restore the BIOS code to the primary
page.
To recover the BIOS code, complete the following steps:
1.
Turn off the blade server.
2.
Remove the blade server from the BladeCenter unit (see “Removing the blade
server from the BladeCenter unit” on page 29).
3.
Remove the cover (see “Opening the blade server cover” on page 34).
4.
Locate jumper J12 (BIOS code page jumper) on the system board.
Chapter 4. Diagnostics
25