My G4 MDD won't boot at all

My G4 froze last saturday and after a forced shut down, the fans would start spinning really fast and nothing else would happen. After reading some of the threads on that subject, I did a deep PMU reset, didn't work the first but worked once I booted the G4 without any RAM. I shuted it down, reinstalled the memory, 1 DIMM at a time (2x256 & 1 x 512) and everything seemed fine and dandy. It froze again a couple of hours later .
I thought I had a bad memory module so I tried to isolated the problem by trying out the different DIMMs, one at a time, and in different slots.
I also kept on looking around for more info and found out that it could also be my bootup HDD that has some corrupted data. It seemed to make sense as I just installed a new HDD a few days before and use Carbon Copy Cloner to copy the content of my previous booting HDD.
But the problem that I have, is that I can't even try a safe mode start as my G4 won't even boot up anymore, even after a deep PMU reset. The only thing that I manage to do is to have boot with no PMU battery and no RAM (heard the one chime indicating the absence of RAM), but now it won't even do that.
What should I do? Is the PMU still good? Is there anything else I can do to try so that my G4 will at least startup so that I can perform a disk check??
Ben

I'd do a block test on the drive and also run the apple hardware test to see if you find anything. a new drive could have bad blocks although not too often. If all passes, you need to try a reinstall (making the existing system your previous system) or clean install.
pressing the pmu too many times or too long will drain the battery quickly but that doesn't have anything to do w/ the fan it could help keep your video from working though. Did you try to zapp the pram?
if you have no video. how do you know it's not booting? it almost sounds like a logic board problem.

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