HI guys, I finally got some type of crash dump from my system. I have tried Ubuntu variations of the 2.6.35, 2.6.36, and 2.6.37 kernels, all of which have crashed on me. Finally, 2.6.37 gave me a trace on the console screen. I had to copy it down by hand, so don't take it too literally. Here is the data. I intentionally left out all of the hex addresses in the call trace. It seems pretty obvious to me that something is amiss in the hardware. I wonder if my heat syncs are full of dust. That will be the first thing I check. Any helpful advice would be most appreciated. Thanks! Andy ======= Hardware error CPU0 Machine Check Exception: 4 Bank 4 2f00001000010c0f TSC 1ae6ab55d12 Processor 2 f5a time 1296699696 socket 0 apic 0 mc4_status uncorrected error, other errors lost: yes cpu context corrupt: yes Northbridge error, node 0, crc error detected on HT link Transaction GEN (GEN), no timeout, Cache level L3/Gen, Participating processor:OBS Machine check: processor context corrupt Kernel Panic - not syncing: Fatal Machine check on current CPU Pid 0, comm: swapper Tainted: G M 2.6.37-020637-generic Call Trace: #MC panic printk mce_panic do_machine_check machine_check native_safe_halt EOE default_idle cpu_idle rest_init start_kernel early_idt_handler x86_64_start_reservations x86_64_start_kernel panic occurred, switching back to text console ======= -- Andy Stewart (KB1OIQ) Founder: Worcester Linux Users' Group Founder: Chelmsford Linux Meetup Group President: PART of Westford, MA (WB1GOF)