Mac Mini LED blinks and shuts down at startup, takes 2-3 tries to boot...

I have a Mac Mini PPC 1.42GHz. When i boot it up after non-use (cold), the LED blinks once per second and it boots all the way into MacOS and shuts down several seconds later. It will usually do the same thing the second time around. On third boot its usually fine. Not thinking its related, I have reinstalled MacOS anyways. No good...
Thanks,
Rich

Welcome to Apple Discussions!
The flashing LED is usually indicative of a power-on self test failure, normally leading to the system failing to boot at all. Once per second would indicate the system fails to recognize available RAM.
The fact this happens when the system is cold (with an implication that it doesn't happen when the system is warm) might indicate the RAM module is no longer firmly inserted, or that the contact face on the pins has oxidized slightly. In this situation, I'd begin by opening the system and removing and then reseating the RAM - in the G4 minis this is relatively easy since there is only one RAM slot, and it is exposed with just the top of the casing removed.

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