Hi, I have CentOS 4.3 installed on my Fujitsu Siemens Amilo D laptop (Pentium IV 2.4 GHz CPU). Everything runs just fine, but I have one problem. When I leave the machine unattended for something like an hour or two, my desktop has "frozen". Unable to recovery anything, even [Ctrl] + [Alt] + [Backspace] refuses to quit X, so I have to hard-reboot by pressing PowerOn/Off for 10 seconds. First thing I did after install, I deactivated the XScreensaver because it kept asking me for a password everytime I stopped typing for 5 minutes. There must be some other power-saving daemon there that makes the mess, but I don't know much about these. I've heard somewhere that ACPI can cause system crashes... but I don't know where to even start to look. As far as I reckon, I have an ACPI daemon running, a thing called 'irqbalance' (that produces a nice red 'FAILED' on every shutdown) and also lm_sensors. Any suggestions? Niki Kovacs