Quicksilver intermittently hangs before startup -- any suggestions?

My Dual 1ghz G4 Quicksilver has begun occasionally failing to start up recently. I'll press the power button, it'll light up, things start whirring inside, then it'll blink three times quickly and hang there. No chime and nothing but black on the screen. I'll hold the power button for 5 seconds to shut down and usually after 3 or 4 repeats of this cycle it'll 'catch' and start up properly, after which it'll run just fine.
I tried zapping the PRAM a few times, but doesn't seem to help. Since it hangs so early I'm thinking it's probably not software related, and the install of the system is quite fresh anyway. The hard drive has shown no other signs of being on the way out. I'm wondering if this is a known issue that any of the whizzes here had heard of before I take any more drastic measures. Thanks!
-Dave

Your internal memory battery may be weak & needs replacement. Check this site for battery part numbers and sources.
Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
http://www.geocities.com/texas_macman/pram.html
 Cheers, Tom

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