If you can't boot your system at all some other ways:
- the dmesg output is contained in /var/log/kern.log you can best get it by 
mounting the root volume on a live-cd and copying the file from there. You can 
also generate the lspci output there.

If you want to know where the system hangs you can disable the splash
screen on boot:

when grub comes up with the boot list select your new kernel and press e to 
edit the configuration.
On the next screen select the kernel line and press e again to edit it. There 
delete quiet and splash.
Then press enter to save it and then b to boot. Then you should see what the 
kernel is doing when it freezes.

-- 
kernel 2.6.28 freeze
https://bugs.launchpad.net/bugs/359109
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