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After erasing & reinstalling Leopard, applications (Safari, Itunes) not starting

Well, a lot of that goes over my head but seems like troubleshooting hardware is... hard.
I thought a processor was the essence of a computer and if it dies you might as well get a new computer. It's good if all parts of a computer can be replaced. But without original spare parts, just when does a G5 stop being a G5 and become a hack Mac..? OK that's kinda rhetorical, doesn't really matter to me... ;)
 
Well, it depends on the model of computer really.

Mac laptops, iMacs, etc, if the CPU or logicboard fails then the computer is done. Doesn't matter if the LB itself is still good while the chip is bad or vice-versa. Unless you have some mad soldering skills (I don't).

So, replacing the entire logicboard (or the computer) is necessary.

But desktop Mac CPUs, G3, G4, G5, etc are generally socket mounted. Unbolt them and you can remove the CPU from the logicboard. The makes either a CPU replacement (if the CPU is bad) or an LB replacement (if just the LB is bad) doable.

Considering that Apple OEM CPUs can go on eBay for as little as $10 or so (depending on speed and model) this makes replacing a dead CPU entirely affordable.
 
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