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I'm sorry. I have no first hand experience with these units, not to mention, I'm a hardware guy. I can repair it, but I have to look in the owner's manual, just like you, to use it. These are questions you should be able to find in your owner's manual. If not there, check with the Roland website.
This means the low-level part of the operating system is corrupted or missing. Simply try reloading the OS by putting the CD into the CD drive. If it does not allow an OS reload or if it fails, most likely the flash ROM which holds the basic part of the OS has been zapped and will require service. You can also try to replace the internal button battery inside that retains the memory.
Press the "UTILITY" button under the Menu heading above the 10 digit key-pad. Under "System Parameter" -Param3, check that PS2 Mouse is set to "ON" and (of course) that the connector is firmly inserted into the mouse connector socket.