Forget the HDDs, disconnect them completely. In fact, disconnect/remove everything except for the floppy drive, and that PCI video card.
The next thing is the ram. You can try firing up the computer without ram: it should at least display an error on the screen (or beep a number of times).
Then, run a pencil eraser on the rams' connectors, and make sure that you brush them off. DO NOT touch those connectors: the oil on your hands will defeat the purpose of cleaning it. Re-seat your RAM firmly, and fire it up again. Re-seat the CPU.
You'd want to double check all the jumpers (sometimes, they go flying off, when you handle the mobo).
If you can't get that mobo to fire up then, then something is wrong with it.
If the mobo fires up, then add each component one by one: sooner or later, you'll find out which one is faulty.
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