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You did not hear the beeps (or you heard a continuous tone, or continous buzzing).
Obviously that is bad. But we have narrowed down the failing item in your computer to either the motherboard or power supply.

If nothing from the speaker: Technically speaking, that might be because your speaker is faulty, but the chances of that are so low that I am going to discount the possibility.  However, now is a good time for you to check that you connected up the speaker correctly.

If the power supply's fan is turning, that does not prove prove that the power supply is good.  All that proves is that part of the power supply is good.
If you have a spare power supply, now is certainly a good time to try it.


What Now?

Click here if the power supply's fan is turning (continuously).

Click here if the power supply's fan turned for a fraction of a second and then stopped.

Click here if the power supply's fan is not turning.