This was just announced today on PhysicsWeb. The recent tests of the superconducting magnets that is part of the LHC have failed.
The start-up of the Large Hadron Collider (LHC) at CERN could be delayed after three of the magnets used to focus and manipulate the accelerator's proton beams failed preliminary tests at CERN earlier this week. The magnets were built at Fermilab in the US, which announced the failure on its Web site. Although CERN has not yet issued a formal statement on the set-back, it looks increasingly unlikely that the LHC will come on-line this year as planned.
The full news report can be found at PhysicsWeb (access requires free registration). It appears that this was a serious failure when a structure that supported one of the magnets broke under high pressure that is some time expected under operations.