Attached Link: http://www.epson.com/cgi-bin/Store/support/supDetail.jsp?BV_UseBVCookie=yes&oid=90754&prodoid=63069457&infoType=Downloads&platform=Macintosh

I'm taking a shot in the dark here...you say it was installed on a (Windows) PC , but don't you need a mac driver for that printer?  Above I provided the Epson web site to download the drivers for that printer. Good luck!