On 17 Feb 2006, at 02:52, Lists wrote: > This has just started to happen since 10.4.5 (combo upgrade and > permissions corrected) > > When I connect a DVI to my Powerbook, while running, both screens > go black and never come back. I have to power down the machine > uncleanly. I use my Al-book (10.4.5) - which is "on" 24/24 - with the DVI port to an LCD projector several times a day with no problem. I know that does not help you, but may show the problem is not universal. regards, Trevor