It’s probably a 5.5mm x 2.1mm connector, not a 5.5mm x 2.5mm connector. They are very similar, but very different at the same time. Don’t mix them up.
Even if you can fix it, which you probably definitely cannot, then I wouldn’t trust it anyway and it could be a fire hazard.
Unfortunately, this is probably now a paperweight.
There are probably black pieces bolted to the heatsinks in there and one or more of those black pieces is probably missing its magic smoke.
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