On 05/13/2012 04:55 PM, Dave Cross wrote: For about the last month I've been getting random frequent session crashes. They take one of three forms: * The PC reboots * The GNOME session freezes * The GNOME session dies and I'm presented with the GNOME login screen All of these results are, of course, really annoying. I can usually run for two or three hours without this happening, but sometimes it can happen every fifteen minutes or so. Whenever it happens, /var/log/messages contains this: May 13 16:45:24 xander gnome-session[3681]: Gdk-WARNING: gnome-session: Fatal IO error 11 (Resource temporarily unavailable) on X server :0.#012 May 13 16:45:24 xander systemd-logind[958]: Removed session 6. I'm running Fedora 16, 32 bit PAE, with the NVidia drivers from RPM Fusion. I'm sure that this isn't enough information to help me, but if you could tell me what other information would be useful, I'm happy to provide it. Thanks, Dave... I was having a similar problem that turned out to be a memory stability problem that was fixed by changing a BIOS setting. Hopefully your motherboard manual will explain which memory settings can provide better memory stability.