Trinity not shutting down properly

Trinity on my new box sometimes starts shutting down and then hangs. I have tried giving it time, but once it has hung, I can leave it for several hours without movement. The file system does not appreciate it whne I use the on/off button or the reset button. My system is: Debian Squeeze Trinity 3.5.13 with Slavek's patches GA-Z77-DS3H motherboard / on 64 GB SATA SSD /home on SATA 2TB drive Where do I go from here? Thanks, Lisi