Unwanted hibernation issue

[ness]

This has happened a few times now since I installed Leopard:

I leave my MacBook Pro on before I go to bed or to school, and when I come back to it some hours later it has gone into some sort of hibernation, but:
- I have no settings indicating that it should hibernate when connected to a powersupply.
- The light on the eject lid-button is not blinking, but shining constant.
- No buttons can retrieve the machine from this hibernation.
- When I put my ear near the machine I can hear it's on, but there's no actual fan og harddisknoise.

Anybody got a clue?

 

[ambivalent]

So do you have to use the power button to bring it back to life?

 

[ness]

Yes, exactly. I have to hold it down to turn it off, and the start it up again.

 

[ness]

I have found two new problem, maybe related to this one I have here:
- I had these programs open: Adium 1.1.3, Firefox 2.0.0.8, Transmission 0.9 3508 and Azureus 3.0.2.2. Suddenly my network stopped or slowed to an absolute minimum, in all programs, even Firefox.
- Then, couple of minutes later, the greyscreen error came and the Mac froze.

My thoughts are these; the greyscreen could have appeared and then the screen later shut down, which resultet in the unwated hibernated mode I first saw as the great issue.

Any ideas?