The most obvious candidate is simply to remove and reinstall any installed RAM expansion card.
By this, I assume that you mean any extra additions made to the computer?
Since the most likely user addition is RAM, which is retained only by spring clips and is often user-installed, it's also the most likely culprit for this problem - besides being the easiest candidate for a quick reseat-and-test. TTBOMK there are no other expansion/connectivity options for iBook which connect directly to any of the main internal buses, and hence no other obvious candidates. The flash is surface-mount, not socketed. Given the way AirPort is attached to the system, it's unlikely to be the culprit (since there is no startup chime and the screen never lights, it's probable that the CPU is either not running or has gone into deep space before or during power-on self-test, because of some device only partially connected the A/D buses that is coming on-bus when it's not supposed to, hence interfering with flash read cycles. It's not *likely* that AirPort could do this, though it is *possible*).
But it could easily be an opened via or bad solder joint anywhere in the system.
And by this, I think that you mean a connection on the mother board?
What I said is "anywhere" in the system, which consists of the planar (what you refer to as the "motherboard") and possibly other subassemblies.
It's also quite possible that it's an electronic failure; for example, a cap gone bad in one of the SMPSs in the device, or an inductor with a cracked wire that used to be making contact but now isn't, or a ferrite-cored inductor that's cracked and has gradually lost core material and changed value until the SMPS oscillator no longer starts up (though the user would probably hear the pieces rattling around if this was the case). The HDD is powered from a +5V rail, so the fact that it spins up doesn't mean the PSUs are all good. It's perfectly possible that Vcore or Vio aren't being generated correctly. The symptoms are also not inconsistent with ESD to one of the major ICs in the unit.
All that is, however, not germane to the issue, which is that the simplest and likeliest fix is to remove and/or reseat installed expansion RAM. No need to look for exotic explanations or detailed fault-finding techniques when a simple procedure is likely to fix the issue, and quite unlikely to cause further harm.
-- Lewin A.R.W. Edwards http://www.zws.com/ Learn how to build high-performance embedded systems on a budget! http://www.amazon.com/exec/obidos/ASIN/0750676094/zws-20
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