Just a little bit of back history here. I created this server when Red Hat 9 was the latest greatest thing and it has been running like a champ ever since. Recently, it started locking up when I would enter X11. I thought the problem might be a power supply as it was making some noise, I switched it out, got rid of the noise, but, not the lock up.

I have to admit, I am not much of a tinkerer when it comes to Linux, I will install and get the things I want to work working, then leave it alone, typically it runs for years and years with no problem. Nothing has been installed or changed on this box. Absolutely everything works fine, with the exception of X11, which did work for 10 years. Now it freezes within 1-5 minutes of logging in (if I stay at the username and password screen it seems to run fine). If I run the failsafe windows manager, it seems to also run fine. If I run KDE or Gnome, the mouse will still move around the screen, but, nothing will respond. I can kill X and restart and it is back to normal.

I have tried changing resolutions and that doesn't seem to work. Like I mentioned, failsafe seems to be the only windows manager that doesn't lock up.

Any idea what the problem might be? Or where to find some additional information?

That sounds like a thermal problem to me. I'd first check for dust accumulation and dead fans.

Huh, I will give it a good cleaning and look for any fan problems, just seemed like if that was the issue, it wouldn't only happen when X loaded. It still runs for months as long as I don't load X. Even when I do load X and it freezes, I can still use ssh to login and just kill the X process.