Your Epson printer offline mac may be due to several possibilities. These possibilities may be related to the issues caused by cartridges, papers, ink, loose connections, or hardware issues. However, the main issue would be related to the power cord being loose. This must have switched off your printer. The other reason would be your printer machine must have gone into sleep mode. Fixing both the problems is simple. All you need to do is, initially, turn off the printer and remove the power cord from the socket. Wait for a few minutes. Then, insert the power cord into the socket. Turn on the printer and let it warm up. The printer will start working.