My powerbook will not awake from sleep recently. I am running 10.4.1. This seemed to coincide with the last security update. It is a random thing. About one time in 10 the display will remain blank when I open the lid. Anyone know about this or have a similar problem? I seem to remember this happening sometime in the 10.3.x series and it was fixed with one of the patches they released. Any suggestions as to what I could try and fix it?