Have you confirmed your MaxDB system is up and running and the SIDadm account can log into the MaxDB server?
Could you also pull up your installation directory of your MaxDB system (ex. on a Windows 2008 R2 MSSQL it would be 'C:\Program Files\sapinst_instdir\NW740\MSS\INSTALL\NW740\MSS\DISTRIBUTED\JAVA\DB') and look through the latest time stamped logs; I have had good luck with sapinst_dev.log, sapinst.log, jload.java.log, Jload.trc and jload.log.