Update tackles problem of Apple notebooks unexpectedly shutting down, an issue that has irked some users for months.
The MacBook SMC Firmware Update 1.1, released for download Thursday, tackles a problem that has .
Apple advises people to install the software on all MacBook systems, including those that have received warranty repair.
It also said that users of Mac OS X 10.4.7 can download and install the SMC update, but all others will need to first upgrade their operating system to Mac OS X 10.4.8, the latest version.
The shutdown problem was first noted in July, a couple months after the 13-inch wide-screen MacBook debuted. Owners, frustrated by the situation, began logging complaints on a user site, Macbookrandomshutdown.com. More than 1,500 people have registered on the site since its launch in August.