Upon boot the power supply fan races but the PC will not boot,the fan motor just

When I attempt to boot up my Dell 8400 desktop the power supply fan races faster and fasterbbut the PC does not boot up.I hold in the on/off button until it shuts back down before the fan gets damaged or something.Has anyone else had this to happen?
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More about upon boot power supply races boot motor just
  1. Test the power supply with a $10.00 tester.

    "New build won't boot" checklist

    http://www.tomshardware.com/forum/261145-31-build-post-checklist
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