Mac (1.83GHz Mac mini (MB138J/A)) の起動に時間がかかるようになった．起動音，中央に Apple マークの灰色の画面のあと，青い画面の中央にスピナが出るのだが，このスピナが回ったまま数分待たされる．
/var/log/system.log を見たところ，次のように Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3) で時間がかかっていた．
Feb 24 22:41:17 hostname configd[37]: setting hostname to "hostname"
Feb 24 22:41:21 hostname kernel[0]: USBF: 24.325 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:41:21 hostname configd[37]: AppleTalk startup complete
Feb 24 22:41:33 hostname kernel[0]: USBF: 35.325 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:41:42 hostname kextd[10]: IOKitWaitQuiet() timed out waiting to write kernel symbols
Feb 24 22:41:44 hostname kernel[0]: USBF: 46.325 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:41:52 hostname kextd[10]: writing kernel link data to /var/run/mach.sym
Feb 24 22:41:55 hostname kernel[0]: USBF: 57.326 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:42:06 hostname kernel[0]: USBF: 68.326 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:42:10 hostname configd[37]: InterfaceNamer: timed out waiting for IOKit to quiesce
Feb 24 22:42:10 hostname configd[37]: InterfaceNamer: Busy services :
Feb 24 22:42:10 hostname configd[37]: InterfaceNamer: Macmini2,1 [1]
Feb 24 22:42:10 hostname configd[37]: InterfaceNamer: Macmini2,1/AppleACPIPlatformExpert [1]
Feb 24 22:42:10 hostname configd[37]: InterfaceNamer: Macmini2,1/AppleACPIPlatformExpert/PCI0@0 [1]
Feb 24 22:42:10 hostname configd[37]: InterfaceNamer: Macmini2,1/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI [1]
Feb 24 22:42:10 hostname configd[37]: InterfaceNamer: Macmini2,1/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/USB7@1D,7 [1]
Feb 24 22:42:10 hostname configd[37]: InterfaceNamer: Macmini2,1/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/USB7@1D,7/AppleUSBEHCI [1]
Feb 24 22:42:10 hostname configd[37]: InterfaceNamer: Macmini2,1/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/USB7@1D,7/AppleUSBEHCI/iPod@fd630000 [2]
Feb 24 22:42:10 hostname configd[37]: InterfaceNamer: Macmini2,1/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/USB7@1D,7/AppleUSBEHCI/iPod@fd630000/IOUSBInterface@0 [1]
Feb 24 22:42:10 hostname configd[37]: InterfaceNamer: Macmini2,1/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/USB7@1D,7/AppleUSBEHCI/iPod@fd630000/IOUSBInterface@0/IOUSBMassStorageClass [1]
Feb 24 22:42:14 hostname kernel[0]: display: Not usable
Feb 24 22:42:17 hostname kernel[0]: USBF: 79.327 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:42:29 hostname kernel[0]: USBF: 91.327 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:42:40 hostname kernel[0]: USBF: 102.328 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:42:52 hostname kernel[0]: USBF: 114.328 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:43:03 hostname kernel[0]: USBF: 125.328 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:43:15 hostname kernel[0]: USBF: 137.329 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:43:26 hostname kernel[0]: USBF: 148.329 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:43:38 hostname kernel[0]: USBF: 160.330 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:43:49 hostname kernel[0]: USBF: 171.330 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:44:01 hostname kernel[0]: USBF: 183.331 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:44:12 hostname kernel[0]: USBF: 194.331 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:44:24 hostname kernel[0]: USBF: 206.331 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:44:35 hostname kernel[0]: USBF: 217.332 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:44:47 hostname kernel[0]: USBF: 229.332 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:44:58 hostname kernel[0]: USBF: 240.333 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:45:10 hostname kernel[0]: USBF: 252.333 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:45:21 hostname kernel[0]: USBF: 263.333 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:45:32 hostname kernel[0]: USBF: 274.334 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:45:43 hostname kernel[0]: USBF: 285.334 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:45:54 hostname kernel[0]: USBF: 296.335 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:46:05 hostname kernel[0]: USBF: 307.335 AppleUSBEHCI[0x2bfb800]::Found a transaction past the completion deadline on bus 0xfd, timing out! (Addr: 5, EP: 3)
Feb 24 22:46:14 hostname /usr/libexec/hidd[28]: Timeout waiting for IOKit to be quiet
Feb 24 22:46:14 hostname /usr/libexec/hidd[28]: IOHIDEventQueueCreate: Unable to allocate queue memory from IOHIDSystem. (0x10000003)System Profiler で見たところ，本体の USB ポートのうち 1 つが Bus Number: 0xfd だった．これが上のログで言われている bus だろう．このポートには USB ハブをもつディスプレイを接続している．ディスプレイには iPod と携帯電話を接続していた．ログメッセージ中にある Addr: 5, EP: 3 がデバイスを示しているとも思えるが，不明．上のログにあるように iPod には Busy services とのメッセージが出ている．携帯電話には Mac 用のドライバなどが提供されていないため，ただ充電するために接続している．
とりあえず，iPod と携帯電話をディスプレイから外して起動するようにして，様子を見ることにした．もし解決したら次は片方ずつ接続して原因を突き止めようと思う．もし解決しなかったらディスプレイから本体への USB は外し，ディスプレイの USB ハブは諦める．
つづく．
