I am stuck at work right now and can't really look up too much in the way of specs right now-
But I can believe 2 sticks of ram are dead or incompatible.
Some systems are VERY picky about ram.
power issue: if the ac adapter/supply is insufficient, booting can be a problem. Make sure it is rated for the voltage and at LEAST the amperage/watts required.
ide issue: I have seen onboard ide controllers have a dead channel or completely quit: testing this is fairly simple: boot with NO ide devices attached. If it works every time, you have an issue. If there are multiple channels (each channel supports 2 devices) try them one at a time.
Not sure if any of that will help.