So I installed Debian 8 onto a USB hard disk. This boots fine on other machines - an Alienware laptop, my desktop and so on. In the Thinkpad it boots, grub comes up, and then it starts to load. It displays:
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Loading linux 3.16.0-4-amd64
Loading initial ramdisk
I also get the same behaviour when trying to boot to 8 with the upgraded distro I had installed on the laptops built-in hard drive.
I have previously managed to boot this laptop from the exact same USB hard drive, but an earlier version (it was 6 or 7, I forget which).
How do I begin to diagnose why Debian 8 is failing to start up on this machine?