You have a bad memory (module)? Then this little blog entry might save the day:http://aplawrence.com/Blog/B1237.html. I used it on my laptop successfully. The patch of BadRam does run perfectly on the latest gentoo-dev-sources. I even think this patch should be added permanently. So how does it work? You use memtest86 to detect what parts of the module is broken. Then you add those entries to grub (memtest86 spits out the correct syntax for badram.). With the badram patch, your kernel then reserves these memory locations so they can't be used by other processes. Pretty neat thinking, right?