I got a ThinkPad X121E which refuses to install Ubuntu Linux (neither 32 nor 64 Bit). Windows7 64 Bit is no problem though.
Here the details:
Installation works perfectly (I do partitions manually and encrypt the
After restarting, Ubuntu doesn't boot, but the ThinkPad BIOS does boot twice and beeps when leaving the pre-boot window. After a short moment the message
Operating System not found
is displayed, or depending on wether the BIOS settings are UEFI-only/Legacy-only the LAN Boot routine tries before that. If you now reboot it again, it won't boot twice but still beeps when leaving the pre-boot window.
Hope that were the kind of information you actually needed to help.
A few links which seemed kind of promising:
"No operating System found" (German) was really interesting as it is stated that GRUB wont work with GPT (and
fdisksays that GPT is used), but sadly cuts off too early to the luck of the OP with his 32Bit system (that failed on me though).
This UbuntuForums.org thread is interesting but cuts off on a too early stage as well.