This 800W ATX PSU Blows the mains fuse when you power up. Can We Fix Repair The Power Supply?

I plugged this ATX Power supply in and the mains fuse blows. What is causing the problem and more importantly can we fix it?

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Equipment used in my videos. These are affiliate links, you pay the normal price and I make a small commission.
DM40C
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Aneng AN870 (Same as Zoyi ZT219)
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Zoyi ZT-DQ02
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MESR-100 ESR METER
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FNB58 USB ANALYZER
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NI-210SC Curve Tracer
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NI210SJ (cheaper option but watch my review)
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PCI POST ANALYZER
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FNIRSI 1014D SCOPE
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NPS3010W 30V 10A PSU
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KADA 853B Preheater
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FNIRSI SWM-10 Spot Welder
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INFIRAY P2 PRO IR CAMERA + MACRO LENS
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DESOLDER BRAID (I use size 8045)
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HX-T100 SOLDER
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