percyt wrote:The mouse still moves but no key presses, mouse clicks do anything - I have to physically power it off and then back on.
I take it you have a 3D system like nvidia or ati. Search the net, you will find loads about it. I myself started a thread on it here:
The really weird thing is that I rebuilt the same componenets onto a different motherboard and it stopped!
If you are using nvidia graphics, and you don't actually need 3D acceleration, change the video driver from "nvidia" to "nv" in the file "/etc/X11/xorg.conf".
When the freeze occurs, try this:
Holding down ALT and SYSRQ, press in turn, with a few seconds wait, S, U and B. If your kernel has "Magic SysRq" enabled, it won't prevent a reboot, but at least it will be a clean reboot.
ALT+SYSRQ+S = Synchronise Disks
ALT+SYSRQ+U = Unmount Disks
ALT+SYSRQ+B = Reboot.
Hope this helps.