Hi all, often my PowerMac dual G5 with MOS 3.9 (still to update to latest MOS but this is not MOS related I think) fails to boot, the screen remains black and if I wait further minutes the fans slowly accelerate going crazy upto full speed. Every time I have to restart with the power button, often I have to try even 4 or 5 times before I finally see the grey boot screen appearing. Very frustrating. This situation has apparently worsened during the last months, while initially the issue happened very seldom. I suspect this problem may be related to the HD, which perhaps fails to speed up or to start. It is still an old SATA 1 though which always worked perfectly. Any suggestions ? Thanks.