On first boot of the day, or one longer than 2 hours since the last cold boot, I get complete instability with cascading program crashes culminating in either a BSOD or a Black screen. It will continue to reboot and crash if I let it.
When I saw this and that you had G.Skill memory, I was sure it would be the same problem I had. I was suffering from exactly the same symptoms. If you check the G.Skill forums, you'll see numerous reports about this. Apparently they made a bad batch of memory. I built a similar my system i January and just finally got my memory RMA'd. Problem solved! G.Skill got new memory back to me just five days after I sent the old ones off, so I'm still happy with them, and actually just built another AMD system with G.Skill and Gigabyte and it's rock solid.