Eric, On Tuesday, June 22, 2010 you wrote: > I have recently upgraded to 2.6.18-194.3.1.el5 and within several days > the machine crashed with the following error (repeating in mcelog): [...] > Would this error indicate a motherboard or CPU problem? How can I > diagnose? or is there something funny with the Kernel? I ran across the same problem some time ago. At that time the kernel was updated to recognize a new chip set (the one I use). The errors appeared with the new kernel, but of course they were there (undetected) before. I was checking CPU, memory and finally main board and it turned out that my TYAN board was faulty. You may want to google the error message. I found the exact error string to appear in the new kernel version for the first time. best regards --- Michael Schumacher PAMAS Partikelmess- und Analysesysteme GmbH Dieselstr.10, D-71277 Rutesheim Tel +49-7152-99630 Fax +49-7152-996333 Geschäftsführer: Gerhard Schreck Handelsregister B Stuttgart HRB 252024