A couple of possibilities- If there is no fuse holder on the rear of the box, it may not be user-replaceable but soldered onto an internal board. If it has blown, either there has been a component failure in the power supply that caused the fuse to fail or the supply is not starting up as it should, a problem caused by cheap capacitors in certain areas of the supply. Unless you have at least a multimeter, this is not a good choice as a DIY repair.
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