HL-3450CN FAQs & Troubleshooting HL-3450CN Not your product? Sort by: Updated Date Popularity 3 Results 1. 16/11/2015 I heard a beep sound from the UPS (Uninterruptible Power Supply) when I turned on my Brother machine. 2. 08/02/2007 My computer indicates that the printer it powered Off. 3. 16/01/2006 The machine does not print anything. More FAQs Others FAQs & Troubleshooting