What type of fuse did you replace the blown PTC fuse with? Another PTC? Slow or fast burning fuse like an automotive or glass-tube? If it was a PTC fuse they may be doing it's job and cutting out power and resuming after it's cooled a bit. Another thing is what sized power supply are you using? If it's an ATX powersupply, what is it's nameplate current rating for the 12v rail?
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