ATCSCC ADVZY 113 ZLA 04/30/2014 ZLA GROUND STOP
Will update this situation as details are available. No details at the moment. If you have airborne inventory, they are likely holding and may have to divert. This is a developing situation.
RAW TEXT:
ATCSCC ADVZY 113 ZLA 04/30/14 ZLA GROUND STOP
DESTINATION AIRPORT: ZLA (TO AND THROUGH)
FACILITIES INCLUDED: ALL + CZY
GROUND STOP PERIOD: 2100-220
REASON: ERAM/DARC FAILURE
REMARKS: STOP ALL ACFT TO AND THROUGH ZLA.
DARC = Direct Access Radar Channel
ERAM = En Route Automation Modernization
Looks like its an En Route Automation Modernization (ERAM) failure.
The computer system used at the FAA’s high altitude en route centers is considered the backbone of the nation’s airspace system. It processes flight radar data, provides communications and generates display data to air traffic controllers.
That darn Bono just has to get his nose into everything, eh? 
Or so the government says. The U2 flies way above regular traffic. An article I read today (on my phone so I don’t have the URL) states that it may have been Russian aircraft flying off the coast of California that caused the outage. That sounds more reasonable than a U2 crashing the system.