Try removing the '030 cards, should boot with the on board CPU without changing anything. In fact, remove any Zorro cards in there too. Try other outputs (composite). If you have a voltmeter and know how to use it, check the voltage coming out of the power supply.
If you get no drive activity and no display at all, that sounds like it could be a bad power supply or else something critical on the motherboard is dead. Maybe it's something easy to fix like replacing a socketed chip. It could be you have a dead motherboard that will be cheaper to replace than fix.
