see here
http://forum.thinkpads.com/viewtopic.ph ... 71#p487571

this problem is very common in many x31, including mine(2672CBJ): 1. at first the x31 won't boot happened occasionally after chrismas. when i power on the x31, all the indicator light blinked quickly, then only "z" light still on with the fan running. but wait some time and try again will occasional...