ford escort 1800?

Hi Air con Stoped Working And Blower.I Was Told It May Be FUSESo I Pulled Out Fuse By Fuse Checking ThemOne Was Blown I Replaced It And Now Car Wont Turn Over.All Lights Are On DASH Lights WorkElec Windows Work Ect.Its Just The Starting Turn Key Nothing.I Went To ScrapYard Got Some Relay Fuses.My Son Say It May Be The KEY And Memery On Car??. Thanks.arthur.