I have been watching this problem (had it open before and we never resolved it). I've seen twice that it takes a long time to "prepare network settings." After that the Wacom tablet loads then the icons in left tray which are followed by desktop icons (some duplicates of tray). Then the "startup" icons begin to load. It loads the USB icon and the sound icon then Quicktime which I want to stop but cannot find anywhere. At that point and just before it loads Avast! AV it drops and shuts down.
I do a softboot with button before it completely shuts down, and it all comes up just fine on second go.
I'd love to find how to prevent some icons (programs) from loading in the startup systray as they run in the background loaded or not (i.e., spybot, quicktime, roboform). They simply are NOT in any startup directions that I have ever found no matter how hard I look. The only one I can find is my screen shot. ZA loads without being in startup along with Avast!. Go figure! How many places are there for startup items.
As for this shutting down just as it comes up, I still do not think it's the motherboard. It's just too clean and perfect. You can't tell anything's been used inside my "box." It's all tucked inside the desk. It gets dust and cat fur, but I keep it blown out really good. I think (and what do I know?) that this is some "instruction" the program is receiving just as the AV is trying to load. Perhaps Avast! and ZoneAlarm tangle right then? Possible? Could that cause it. I'm out of ideas. But it's not harming anything. Just takes extra time now and then to get Windows up and going.
Thanks. I'll be off by the 15th so maybe this time we can resolve this (and the other stuff about startups that I snuck in here). ;)