This server was running fedora core 2 till 12/2/2005. It had an impressive uptime of 180 days or so. On friday I upgraded to CentOS 4.2. After upgrading to CentOS 4.2 this server has been throwing kernel panics every 10 hours or so. These are some of the error messages I am getting on the console: "CPU 0:Machine check exception :4 Bank 0 : f672100000000833 TSC 112180365ccf ADDR e2c7f7c0 Kernel Panic - Not synching Machine Check" This is a production server. I would appreciate any help. S