Before you trash your s900 please try this.
Unplug it. Unplug and set aside the keyboard and mouse. Remove the PRAM battery (which is near the floppy on the motherboard). Press and hold down the CUDA button for 30 seconds. Now find something else to do that doesn't involve this computer.
Let the computer sit disassembled overnight. In the morning put it back together including the battery with only the power cord and the keyboard and mouse attached. Power it up and zap the PRAM several times, 5 or 6?
What this will cure is a deeply corrupted PRAM. This happened to my s900. I got the bright idea of just seeing if my s900 would boot up using an OS X system disk.
It wouldn't. What it did do is try to rewrite the PRAM so that the s900 wouldn't recognize any volume connected to it. None keyboard controls would work (PRAM powers the keyboard) so I couldn't turn it off using the keyboard. When I turned it on I could hear the drives spin up. Then nothing would happen. S900 in a coma.
Removing the PRAM battery and unplugging the power cord disconnects the PRAM from any power supply. Holding the CUDA button down will zap the PRAM if there is power to it and then this will drain the power from the PRAM and obliterate the mangled code in your PRAM.
Then zapping the PRAM on power up resets it to default and like magic your computer works again.
I understand that certain types of security software will cause a comatose Mac. I just thought it might be nice to see if my s900 would start up with an OS X boot disk. It won't, don't try it.
Mark Murphy
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