Library is marked offline after turning Off then On
Article ID: MM0052 Library is not detected by OS after cycling power
Library status is marked offline after power to the library has been recycled. Library does not appear in device list.
This happens especially in Windows 2000, where the operating system automatically detects that the device is disconnected and therefore removes it from the device list.
Redetect the device from the Operating System. In some situations, you may have to reboot the computer to successfully redetect the device.