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I just purchased a new computer to replace the old one that suddenly stopped working. Both were iMacs, the one that broke was a mid 2009 an the new one is the late 2015 model. I never had a problem running my printer on my old iMac, however on the new one it will often not connect to the printer. When it does connect and start to print it will disconnect after a few seconds of printing. The printer is a RepRap running Marlin on a Sanghololu 1.3a board. I have the same version of repetier host installed along with the same FTDI drivers as I had on the old computer. Any suggestions will be appreciated.