Hello everyone, My i5 1.7 GHZ MBA freezes this evening again. Last time was middle of August. When I checked the console error messages, I found the following: 5:31:21 PM com.apple.usbmuxd: HandleUSBMuxDictionary client 0x1003160d0-ITunes/com.apple.iTunes using Library usbmuxd-221 built on May 16 2011 at 00:10:01, running usbmuxd-221 built on May 16 2011 at 00:14:56 5:31:21 PM [0x0-0x22022].com.apple.ITunes: The plugin 'Quartz Composer Visualizer' failed to load because it has the wrong CPU architecture for this version of ITunes. (3835) 5:32:06 PM kernel:MacAuthEvent en0 Auth result for: b0:e7:54:02:8e:41 No Ack 5:32:06 PM kernel:MacAuthEvent en0 Auth result for: b0:e7:54:02:8e:41 Unsolicited Auth 5:44:49 PM bootlog: BOOT_TIME 1315734289 0 5:44:52 PM kernel: PMAP: PCID enabled ..... Can anyone advise me what's wrong? Also in the event of another freeze, is holding on the start (top right hand corner) button the correct way to rectify the freeze? Thanks.