That doesn't seem surprising to me.
The amp draw is "average", but the startup is going to be tremendously high, as the brushes essentially short on the first position of a rotor coil.
I use a blower from a Ford Mustang, and I can't get it to start at 12 volts (same prob; the PSU shuts down). I haven't taken any measurements yet, but I'll try to "pre-spin" it, and see if it'll go. Mine starts just fine at 5 volts.
An inductor coil might help your fan get started, but don't ask me which one... For sure if you can't start it normally, it's gonna be useless to you.
That aside, I'd recomend that you use the protection circuit outlined in the "Johnson pump" thread (in my sig), to protect your CPU from spikes and negative voltage throws.
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