I was running truenas on a power edge t330, one of my children decided it would be a good idea to kill power to it on an attempt to reset our modem. Long story short, it killed either the CPU or motherboard. Either way I can no longer get that to boot up. I have a spare computer that I can move the PERC over to, and some breakout cables to connect to the drives instead of the backplane. Is there a way I can still recover the data? Let me know if more info is needed
In general, this is quite easy.
If you have another computer, try and re-use the previous boot device. If it does not work, then simply install TrueNAS again, preferably the same version. Then after boot, if you have the configuration saved, restore the config and reboot.
All should be back to normal, with the exception of the network port. You will likely have to manually change it from the console because the new computer system board likely does not use the same make & model of network interface chip. Or even if it does, the NIC may be at a difference PCIe address.
TrueNAS was specifically designed to be easy recovery if you loose your boot device. Or even the whole computer, (but not the data drives).
ZFS was also designed to maintain existing data in any pools, assuming no hardware faults:
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Fingers crossed, I’ll post with any more questions I have. Appreciate it!
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Maybe i come late, but in your place (if not already tried) i would try a complete cmos reset before give for dead CPU/motherboard 
unplug PSU - cmos battery → change the cmos jumper (or short the pins with a clip, depends on motherboard) for 20-30s and try a minimal boot with just 1 stick of ram (in each slot if need). Destroy a pc just killing power is the worst scenario not impossible but really the worst
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