Just to add some possibilities, all likely possible and some of them hard to impossible to recover from ...
- The quartz got cooked, than baked, then crumbled like cookies. Virtually can not be replaced. - At least not in a sane way.
- A capacitor blew. Easily to be spotted in eyesight. - Can be repaired and may be worth it; If you can do it yourself and already have the tools. - Otherwise: watch out for a replacement.
- A colony of wool-mice spun a rich textured pad made of dust. - The dust devil likes to digests those filthy ahem, felt-ish .. pads. - Let him have its will, clean up and out carefully; If you are lucky the cooler can spin freely and actually let the hardware breathe again, so the sensors do not ring the alarm and instant-kill the power-supply to avoid bad bad burnings ...
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Hope it helps. Probably maybe possible ... Thanks for reading.