Hi, I hope that someone out there can help me. I have an 8-way Opteron running Fedora 5. Yesterday I attempted to add 8 Gb of ECC RAM to the current 8 Gb of ECC RAM, and upon selecting the OS from the GRUB menu got a kernel panic screen. I've since removed the new RAM, returning the memory configuration to exactly the starting state, and still no luck. I've also tried to run memtest86 but it hangs, and I cannot boot into linux rescue mode. The message that I get there is: kernel direct mapping tables up to 200000000 @ 8000-8000 PANIC: early exception rip ffffffff801172db error 0 cr2 ffffffffff5fd023 PANIC: early exception rip ffffffff801172db error 0 cr2 ffffffffff5fd023 The system reports 7166 MB of memory present. I am going to try the memory modules one at a time, and hope that the problem lies there. A different hardware problem would not be good, and a hard disk problem would be horrible. Thanks for any help! -- Dr. Peter D. Roopnarine, Assoc. Curator Department of Invertebrate Zoology & Geology California Academy of Sciences 875 Howard St. San Francisco CA 94103 Phone: (415) 321-8271 FAX: (415) 321-8615 WWW: http://www.calacademy.org/research/izg/roopnarine/peter.htm "there's a mansion on the hill"