Thanks for the info. In the rare event of a chime, it stalls somewhere after the chime. No screen power on, no HDD activity.
As I said earlier, the machine always powers on, but does nothing else than spinning the HDD and making a click in the DVD drive. I could not even get a chime the last 10 times I tried.
I still strongly suspect the power board, as the DVD drive does not seem to get enough power to even do its power-on sound. Even if the RAM was faulty, the drive would initialize, as this is what it does when it gets the 5v it needs. If you try, for instance, to power a HDD with 5v but too little mA's, you will just hear a small "tick tick tick" as it tries to spin up, but fails because the current is too low.
The DVD drives behaves much like this. You hear a small "tick" and nothing more, and no chime. Just a "pop" in the speakers and a "tick" in the DVD drive as the power button is pressed.
Sometimes, usually after resetting the PMU a number of times, the DVD drive completes its init cycle, and then the macine stalls. If the chime appears, the same thing happens, but it never boots.
Oh, I should mention, the symptoms are the same if I power it from the battery or from the adapter (Home-made 24v one.)
Could a wasted PRAM battery cause all this issues? I think not, but you never know with these machines
As I said earlier, the machine always powers on, but does nothing else than spinning the HDD and making a click in the DVD drive. I could not even get a chime the last 10 times I tried.
I still strongly suspect the power board, as the DVD drive does not seem to get enough power to even do its power-on sound. Even if the RAM was faulty, the drive would initialize, as this is what it does when it gets the 5v it needs. If you try, for instance, to power a HDD with 5v but too little mA's, you will just hear a small "tick tick tick" as it tries to spin up, but fails because the current is too low.
The DVD drives behaves much like this. You hear a small "tick" and nothing more, and no chime. Just a "pop" in the speakers and a "tick" in the DVD drive as the power button is pressed.
Sometimes, usually after resetting the PMU a number of times, the DVD drive completes its init cycle, and then the macine stalls. If the chime appears, the same thing happens, but it never boots.
Oh, I should mention, the symptoms are the same if I power it from the battery or from the adapter (Home-made 24v one.)
Could a wasted PRAM battery cause all this issues? I think not, but you never know with these machines