Its a Trickle Diode issue on the PSU that goes bad on the IIcx/IIci/Q700. I seen google a .pdf to check and fix this:

http://www.shobaffum.com/iici/trickle.pdf

If not, recapping the motherboard works, see:

https://68kmla.org/forums/index.php?/topic/21612-iicx-power-supply-clicks-no-go/