Hi, When uptime reaches around three days, somehow a weird situation is happening. X usage suddenly jumps around 99% freezing the X environment. X seems to have frozen, but I can move the mouse pointer. Nothing else can be done. I log on to this machine from another one on the local area network using ssh, and reboot it for a temporary solution. If I restart only the X server, I believe it doesn't take that long to have the problem again. a total reboot gives me another 2-3 days. as soon as it freezes, connecting to this machine from the other one, I tried looking at the log files under /var/log several times. no entry has been added to xfree log in the last 10-15 minutes. and the files which have been modified in 15 minutes does not have any entries relating to the situaion, at least to my knowledge. suspecting the ram of this partially new system, I checked my rams with memtest-86-3.0. no problems are reported. suspecting the gdm, I tried without it as well. problem regenerates as usual. I don't know whether it is related but, another strange issue I am having is that: with or without gdm, sometime(not soon) after X login "alt" key starts not functioning. for example, alt+shift cannot change the keyboard layout or ctrl+alt+f{1-6} cannot take me to the consol and of course I cannot kill the X server using ctrl+alt+backspace. motherboard: Asus A7N8X cpu: AMD Athlon 2500+ video card: creative tnt2ultra 2X video driver: nvidia distro: slackware 9.0 ram: 512MB swap: 256MB Do you have any ideas? where would you think I should start from? thank you, baris