I am using slackware 10.2 - with a custom compiled kernel (initially 2.6.16 - but now upgraded to latest 2.6.21) Hardware listed below.. CPU : AMD Athlon 64 X2 4600 MB : NF-M2 nView - http://www.abit-usa.com/products/mb/products.php?categories=1&model=327 Memory : 2GB PATRIOT PC6400 800Mhz Other : Adaptec UWSCSI 2940 Adaptec 2610SA Sata raid card After installing the new cpu / mb initially with the 2.6.16 kernel I had to add the noapic boot setting to the Kernel to work. After this the machine will work for a while but I it will hang after an hour or so. With either kernel panics / segmentation faults or just lock up completely with no error messages. I have run memtest86 and the memory all seems fine. I have now updated to the latest kernel (2.6.21) and I can now boot with out using the noapic boot option, but I am still having the same problems with the system hanging after an hour or so. I have also tried recompiling with kernel with various different settings :- without smp support ( still crashes ) without my MB chipset / graphics drivers compiled in. Does anyone have any ideas of anything else I could try? Thanks Toby - To unsubscribe from this list: send the line "unsubscribe linux-smp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html