Another IT guys here.
If there is no elemental damage to the actual disks which there shouldn't be (flood, fire, magnets) then a full recovery should be possible.
I have heard of cases where computers get flood damage and a good amount of data is recovered by professionals. This sounds like a typical computer failure, might be the HDD, might be the bios/motherboard.
I wouldnt consider your data lost so dont stress.
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