You should go into the settings to see how the slots are configured.
It may be set to only try booting off of slot 5, which is what the 5.25" drives are mapped to. The 3.5" drives are mapped to slot 6.

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Rockin' Cat,

You're a little mixed up here. The 3.5 drives are slot 5 and the 5.25 drives are slot 6 on a GS not the other way around.

In the long run what he needs is software, since the computer does boot and accesses the disk drive, but since there's no software it just keeps whirring.

Dean