The most common cause of this problem is the lack of a cartridge in the StyleWriter printer. If the adapter is connected without a cartridge in the printer, or if a print job is sent to the printer without a cartridge, the printer runs a self-test that does not complete.
To correct this problem, disconnect the power cord from the StyleWriter EtherTalk Adapter. Install a cartridge in the printer, and turn the printer off. Reconnect power to the StyleWriter EtherTalk Adapter. The printer will power up and go through a test cycle. After the self-test, you will be able to print and power off the printer properly.