Over the weekend one of our Beowulf cluster nodes went offline. It's a Fedora 16 machine. When I try to boot it up, it goes through grub, gets to "initializing ramdisk..." and then reboots every time. It also reboots after the "Starting Windows..." logo animates when booting from a Windows 7 CD. I have run MemTestx86 and it has no errors with repeated passes. It's not currently an overheating problem, but some hardware may have been damaged due to heat stress since until this week we didn't have good ventilation for these cluster nodes on the top shelf.
The machine is one of seven
i7 2600K mini-ITX nodes with only the built-in video. It on the
ASRock Z68M-ITX/HT motherboard. It has been running overclocked to 4.1Ghz with its DDR3 RAM running at 1833 (within specification for this RAM). While trying to diagnose it I set it back to standard clock speeds but it made no difference. I'm pretty certain it's not the hard drive because it passed fsck.ext4 on all partitions when plugged in externally to another one of the nodes and it reboots when booting from CD too.
Is there a way I can increase the level of detail during the Linux bootup so I can see exactly where it is before it reboots?