Update
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Friday 16 March 2018 at 04:11
FIXED
Blown 4 amp, slow blow fuse on the power supply.
Should of checked the obvious stuff first... DOH !
Pro Tip: Have a setup of fuses on hand. I bought a "kit" for this machine from Marco when I ordered other items.
Source: http://pinside.com/pinball/forum/topic/comet-not-working#post-4283470