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Hi guys.

something very strange happened to me after a big storm.

a few power supplies stopped working  (even though I use surge protectors)

Also I noticed one of my miners had some moisture leaking out of it

the stuff that has leaked out has now crystallized like raw sugar

could this be fan bearing fluid from a zap from the storm? if not what else could it be?

I am scratching my head here guys, any help would be appreciated

EDIT:

my mine has antstyle miners and not GPUS

what kind of miners?

Got any pictures?

More than likely the humidity was too high and condensate formed on the PS and poped a cap or something.  Not sure about the crystals but I've seen it before after a storm with high humidity.

Agreed, sounds like high humidity.

This can cause corrosion on hashboards, kill power supplies, or cause voltages on power supplies to drop and fry your miners

Look into a commercial grade dehumidifier

The leaking fluid possibly is silicone oil from thermal pads, I've seen it become crusty and somewhat crystalline when contaminated.

A similar thing happened to me.

I used a DIY watercooling solution to cool my R9 290 cards (cooling was done in series through 5 cards). The radiator was placed outside of my mining room to my balcony. The idea itself worked great, my bedroom/mining room stayed cool and quiet.

But nothing can stay positive for an eternity :P, the winter arrived. When the Claymore miner was open and crunching numbers, my GPUs put out enough heat to keep the water in pipes around 30C. But when the miner stopped for some random problem, that's when the s**t hit the fan. The temperature of the water inside the cooling system dropped to around 4C (often times even lower, the cooling solution was a mix between distilled water and antifreeze), cool enough to create condensation on the surface of my cooling setup inside my mining room. One riser took a deadly blow from this.

Woke up one morning to discover that 4 out of 5 GPUs were recognized by Win 10 and the 5th was not. I tried every different thing to get my miner working with 5 GPUs again but nope. The one GPU was not showing up. I kinda gave up and mined with 4 GPUs after this happening, thought that I had killed the one GPU. The mystery started un-tangling after some days when I randomly saw the riser (what connected the "faulty" GPU) again. One of the caps and the MOSFET were covered by this light blue crystal-like solid. What it was I still don't know, but it probably started growing after the riser got wet by the condensed water (one more riser was growing this weird thing on it, but it survived).

Have seen it a couple more times now, still have no idea what it exactly is.

https://ibb.co/cNg2dd my radiators outside on my balcony

This is most likely the reason.I haven't experience it yet but humidity is one of the factors that can create these crystallized sugar knowing that miners and other components
do have parts that do easily corrode.

Also what kind of weather cataclysm (lighting strike?) had happened? And what kind of power protectors you use. Simple voltage filters unfortunately don't give enough protection.
Often GPU thermal pads can be leaked.

many lightning strikes over night, it was a big storm, i use standard surge protectors and nothing fancy.

from the consensus it sounds like high humidity, would anyone recommend a certain dehum>

But how high humidity can affect to hot hardware? The hardware can only be damaged if water directly hit the hardware.
Also the grounding should be checked carefully. If storms happens often at your countryside proper grounding and lightning conductor are vital

Congratulations! You've mined diamonds instead of Ethereum!

The water itself is a dielectric and will not harm equipment. But due to the fact that there is always dust and dirt on it, they, dissolved by water, create parasitic electrical contacts that will inevitably destroy your video cards. I advise you to immediately turn off the equipment and thoroughly clean it, not only from the water but also from the oxides that are on the boards. This can be done with a clean cotton swab dipped in alcohol.

depends on how big your space is, humidity levels, etc

I use this model:
 https://www.youtube.com/watch?v=D5ms2N4FbOk