Yes, they are the correct cables for a Meteor - the last two pins are not used. When reconnecting make sure the pins line up, ie look for the pin marked '1' on the MPU and make sure it matches the pin marked '1' on the sound card. The fact the sound cables are disconnected could indicate the sound card is stoppping the machine booting, as Stern's are won't to do! If this is the case look for broken wires in the cable or try reseating the connectors. VERY occasinally it is caused by the sound board itself.
cheers
Ian
