370z wont start no power . Where to start

acracing118

2009 370z 6 speed manual.
so all in one day that morning check engine light came on then the key light,
ran a few errands with no problems. then let is set for a couple hrs and when to leave parents house, NOTHING. Battery is fully chargeed. lights work ect.
hit start without clutch and it wont go to acc so something is shuting the juice down. i try to put key in slot nothing still . after a quick search i find the dreaded steering lock mechanisim. ive beat it to death and still no start. Plus i noticed my steering was not locked. i could steering it on to trailer so i wonder if this is my problem or not. ( but number on it is of the old style)
Is there a way to by pass this to test and see if i need a new on with out spending $500 +. what about the ipdm can it be checked.
what items can shut the car down. while i was hauling it home stoped by advance and the cheap scanner wont even comunicat with care without it powering on. any suggestion appreciated. i DONT care a bit to tear this thing apart my self if anyone has a fix , never had a care to dealer that wasnt under warranty and dont want to start now.