Compaq Armada e500 Compaq Armada E500 Series Reference Guide - Page 172

Solving USB Problems - usb boot

Get Compaq Armada e500 - Notebook PC PDF manuals and user guides View all Compaq Armada e500 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 172 highlights

Solving USB Problems Problem Possible Cause Solution External device connected to a USB connector does not work External device connected to USB connector does not work during startup (before Windows 95 loads) External devices in lower tiers do not work The operating system Reduce the number of limits external devices connected external USB connected by USB to devices to no more than two tiers which can two hubs on the first tier, include no more than and no more than one two hubs on the first keyboard and one tier and no more than pointing device on the one keyboard and one first or second tier. pointing device on the first or second tier. During startup, only Use the external device two tiers are only after Windows 95 or supported by the USB Windows 98 has loaded. connector. These tiers can include no more Reduce the number of than two hubs on the connected external USB first tier and no more devices to no more than than one keyboard two hubs on the first tier, and one pointing and no more than one device on the first or keyboard and one second tier. pointing device on the first or second tier. An unpowered hub is connected to another unpowered hub. Use only powered hubs. Make sure that all unpowered hubs are immediately preceded by powered hubs in the USB chain. IMPORTANT: External USB keyboards will not function until the operating system has been booted. 16-30 Troubleshooting

  • 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
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
  • 201
  • 202
  • 203
  • 204
  • 205
16-30
Troubleshooting
Solving USB Problems
Problem
Possible Cause
Solution
External device
connected to a USB
connector does not
work
The operating system
limits external devices
connected by USB to
two tiers which can
include no more than
two hubs on the first
tier and no more than
one keyboard and one
pointing device on the
first or second tier.
Reduce the number of
connected external USB
devices to no more than
two hubs on the first tier,
and no more than one
keyboard and one
pointing device on the
first or second tier.
External device
connected to USB
connector does not
work during startup
(before Windows 95
loads)
During startup, only
two tiers are
supported by the USB
connector. These tiers
can include no more
than two hubs on the
first tier and no more
than one keyboard
and one pointing
device on the first or
second tier.
Use the external device
only after Windows 95 or
Windows 98 has loaded.
Reduce the number of
connected external USB
devices to no more than
two hubs on the first tier,
and no more than one
keyboard and one
pointing device on the
first or second tier.
External devices in
lower tiers do not
work
An unpowered hub is
connected to another
unpowered hub.
Use only powered hubs.
Make sure that all
unpowered hubs are
immediately preceded by
powered hubs in the
USB chain.
IMPORTANT:
External USB keyboards will not function until the
operating system has been booted.