HL-3450CN FAQs & Troubleshooting HL-3450CN Not your product? Sort by: Updated Date Popularity 3 Results 1. 26/08/2011 I heard a beep sound from the UPS (Uninterruptible Power Supply) when I turned on my Brother machine. 2. 16/10/2006 Computer indicates that the printer it Powered Off. 3. 16/03/2006 The machine does not print anything. Others FAQs & Troubleshooting