I had a similar problem with my Athlon system (850 T-Bird CPU) with a VIA chipset motherboard. All my linux OS installs had troubles (RedHat, Mandrake, Sorceror, Slackware) until I tried something different. Normally everything would install OK but after reboot the system would crash or behave abnormally. Finally I tried something different. Reinstalled RedHat (7.2 at the time) and went back into "rescue" mode. Fired up lynx, downloaded a real kernel and recompiled (2.4.17 in this case). After all was said and done the machine rebooted perfectly and my file server has been a happy camper since. So the issue at hand may not be your CPU/motherboard combo but the way the OS treats it upon install. Of course this was just my experience and others may vary but if it helps, you're welcome.
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