are these five tracks on individual track rows in sonar? is there a reason you are doing a select all?
have you already figured out the tracks level relative to each other and now just want to raise them to the peak relative level, or do you want to raise each track such that its peak reaches digital 0?
finally, are you normalizing because you are going to send your track to a mastering house or because you don't want to lose bits, or are you normalizing because you are a purist who never uses multi-band compression and maximizers (limiters) to make your mixes louder?