The Sk-500 Device Cannot Be Selected - Roland Sound Canvas SK-500 Owner's Manual

Troubleshooting
19
If you changed the "File signature verification" settings in Step
6, restore the settings to those before any such changes were
made. Changing these settings requires that the Administrator
or other authorized user log on to Windows.
20
Refer to Setting the MIDI Output Destination (p. 36) to make
the settings allowing the SK-500 to be used with Windows
Media Player.
Are two or more SK-500s connected?
Carry out the following procedure.
1
Quit all applications.
2
Shut down Windows.
3
Remove all USB cables from the computer (except for the
keyboard and mouse), and start up Windows.
4
Connect one SK-500 to the computer, then confirm that this is
operational.

The SK-500 Device Cannot Be Selected

Is the driver installed correctly?
When using a USB connection, the installation must be carried out exactly
as described in Installing the USB MIDI Driver (p. 31). Refer to Is the USB
driver installed correctly? (p. 92).
When using a serial connection, the installation must be carried out exactly
as described in Installing Serial MIDI Driver (p. 40). Refer to Uninstalling
the Windows 2000 Serial MIDI Driver (p. 43).
Has the computer been put into standby mode (Suspend) or
sleep mode with the SK-500's power turned on?
If the SK-500's power is turned on and the computer is put into standby
mode (Suspend) or Sleep mode, the system may begin to operate
incorrectly. In such instances, after restoring operation, quit all applications
using the SK-500, turn off the SK-500's power, and then turn it on again.
98