Connection Proplems

I’ve had my printer for several years now and it has been working however all of a sudden it has stopped being able to connect to my computer claiming “No start signal detected”.

I have tried erasing my hard rave and reloading repetier but the same problem comes up. I have also tried new USB connector cables and cpus but the problem is still there. I have also tried repetier on my mac but still won’t connect (although it doesn’t say no start signal detected) and a stand alone controller which also doesn’t work.

Please can someone help I don’t know what else to try.