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SERVSWITCH™ USB AND USB PLUS
6. Troubleshooting
6.1 Things To Try
This section suggests possible answers for a number of problems that people
sometimes encounter when trying to operate the ServSwitch USB. If the suggested
actions don’t solve your problem, or if you don’t see a listing for the type of trouble
you’re having, contact Black Box Technical Support as described in Section 6.2.
The Switch doesn’t seem to work with my PCs that run DOS, Windows 3.x,
Windows 95, or Windows NT.
USB support in these operating systems ranges from inadequate to nonexistent.
You will need to upgrade the operating systems on those PCs. See Section 4.2.
The Switch doesn’t accept hotkey commands from my USB keyboard.
The Switch can only accept hotkey commands from a PS/2 keyboard attached to a
ServSwitch USB Plus. Unfortunately, the Switch can’t recognize commands from
USB keyboards. See Section 5.4.
My PCs don’t seem to recognize my USB peripherals.
Make sure the operating-system versions they are running actually support USB
properly. Even if they do, you might need to attach a regular PS/2-type keyboard
or keyboard emulator before they will be able to recognize USB devices. See
Section 4.2.
I don’t get any video signal from my Mac CPUs.
When you power up your ServSwitch USB system, make sure to power up the
Switch or a directly attached monitor before you boot your Mac CPUs. Mac CPUs
that don’t sense a video device when they boot up often simply turn off their video
output. See Section 4.4.
My computers crash at odd intervals.
Make sure the operating-system versions they are running actually support USB
properly (see Section 4.2). If they do, call Black Box Technical Support.
My computers or USB devices crash almost every time I switch between CPUs.
Make sure the operating-system versions they are running actually support USB
properly (see Section 4.2). If they do, the enumeration guard time that your
ServSwitch USB is set for is probably too short (see Section 3.1); see how long it
takes your system to enumerate and set the guard time longer than that.