Savin printers & Mac Pro

Good Morning all! I have recently purchased a Savin CLP240 and have 2 power macs and 2 imacs networked to it. When the Macs print to it there is a green tint to everything and the midtones are gone. When I connect a PC to the printer, the print is beautiful ans perfect in color. I have installed a generic drive, the driver that is suppose to go the Mac for each Mac and another type of ghostscript driver...all with the same end result. Does anyone have any suggestions of what I may do to get the Savin to print true color? I have also went into the setup windows and selected fine, 1200 ppi and so on.... Thanks in advance for your help