Flashing power led; no start-up

My Mac Pro has been having an issue; When turning it on, the power light starts flashing, but the hard drive doesn't seem to spin up, and the display acts as though I haven't turned on the cpu. I hold the pwoer button down for a bit, and the cpu shuts off. I tried pulling the plug to reset it, sometimes it works, but today it almost hasn't. Anyone have some experience with that? I read something similar that suggested a RAM issue, but I also read something about a motherboard issue. I haven't run the Apple Hardware test yet, I wanted to post here first in case it wouldn't start up from the test disk.

It's a MacPro1,1, which I believe was manufactured in '07. There are no beeps or sequential flashes produced when the power button is pushed, it simply blinks nonstop at approximately one second intervals. It started up this morning, so I suspect that rising heat from longer usage is causing the bad RAM block to malfunction. I will check out the diagnostic LED's at which point it fails to start, to determine whihc block is causing the problem. I purchased some additional memory about seven months ago from OWC, which I suspect is the block[s] that are faultering. Luckily they give a lifetime warrantee on their memory. Thanks for the information, Grant/X423424X.

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Hi, I am new to the forum but I have looked for an answer before posting.
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(extra info -
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Click here for information.
(45946)

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Flashing power led; no start-up

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