San Francisco ? Happy New Year from Microsoft Corp.: Your Zune is dead.

Thousands of Microsoft’s Zune media players — the software company’s answer to Apple Inc.’s iPod — unexpectedly conked out Wednesday and showed users an error message, prompting references to “Y2K for Zunes.” The problems appeared when people tried to start up their devices.

Frustrated users lit up Microsoft’s online support forum for Zunes with more than 2,500 messages by Wednesday afternoon.

Late Wednesday, the Redmond, Wash.-based company said the outage affected only the 30-gigabyte Zune models and was caused by a problem with their internal clock. Microsoft expected the problem to clear up as the clocks ticked over to Jan. 1, though users will have to jump through some hoops to get their Zunes back to normal, including letting the batteries die down completely before the devices will restart successfully.