My T420s has a cracked power jack. I've already bought a replacement jack based on the great advice here. viewtopic.php?t=114663
Until it arrives, this works to use the machine. I won the lottery and got the nicer AUO B140RW02 v.1
v.1 HD+ screen with 400:1 contrast ratio. 133 DPI is much more pleasant to look at than the 120 DPI of 14.1" WXGA+ of T410s. The mod to upgrade to IPS FHD, and the 2.5" main bay, makes the T420s a much more versatile and futureproof machine than the T410s.
Aaron the Thinkpad Addict. Currently supporting:IBM
Z60m, X60s, X200, T500
Enable advanced features on older Synaptics touchpads with the registry: viewtopic.php?f=2&t=122612