hoping you no alittle about cars ill give ya somewhere to start-first check the battery cable connections at battery,starter,engine block (by starter)and the cable that goes to the under hood fuse box from battery,next you will see a smaller guage wire on the starter witch is the solenoid feed to the starter from ur transmission selector switch.hoping you have a test light(multi-meter prefered) unplug it and check for power there.if you do,have someone hold the key in the cranking position-ebrake on -in park.tap on the starter lightly with a hammer-if it cranks,most likely a starter,if not-on the passenger side of the trans(you can see a switch on the side from the underhood.a heavy shifter cable will be attached to it-follow the wiring harness back up to the first connector on the top of trans-check the pins and connectors there-weve had problems wit h high resistance in the switch causing that connector to melt.also there is a adjustment that can be made for that switch since moving the gear selctor as you stated sometimes works.good luck-its easier than i stated-sorry if any confusion,or take it to ur subaru dealer-he he,