Re:

[Chuck Swiger <cswiger%mac.com@localhost>]

Hi--

On Sep 26, 2011, at 8:34 AM, Riccardo Mottola wrote:
> Now it just happened again. There was no reboot, the machine just hung... 
> stopped responding. Locally, the machine has a black screen and doesn't 
> respond to even simple stuff like caps-lock. So I need to keep the power 
> button pressed and recycle it.

This is sounding more like a failing PSU or maybe leaky caps on the 
motherboard, causing PWR_OK to be de-asserted and the machine to hard-hang, 
requiring a full power-cycle.

Regards,
-- 
-Chuck