Same issue on Thinkpad w500
Work-around for this is to change from switchable graphics in BIOS to discrete (only). I was able to boot again after switching to discrete, but this is not ideal as it will reduce battery life.
To boot into BIOS:
Reboot comptuter and hold down lenovo support button.
In Display section, change setting from Switchable Graphics to Discrete.
Exit Bios, saving configuration.
Reboot.
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