Macbook shutsdown, but then restarts immediately

Since yesterday, my Macbook 4,1 (white) running OS X 10.6.8, restarts every time I try to shut it down. It turns off normal, but one or two seconds after that, the machine reinitialize. What can I do?
Following Linc Davis' instructions in this post, here's the lines showed in Console before boot:
Jan  5 11:13:55 Macbook-2 com.apple.launchd.peruser.501[94] (com.apple.AirPortBaseStationAgent[116]): Exited: Killed
Jan  5 11:13:55 Macbook-2 loginwindow[34]: DEAD_PROCESS: 34 console
Jan  5 11:13:56 Macbook-2 shutdown[212]: halt by Computer:
Jan  5 11:13:56 Macbook-2 shutdown[212]: SHUTDOWN_TIME: 1357395236 157711
Jan  5 11:13:56 Macbook-2 WindowServer[71]: hidd died. Reestablishing connection.
Jan  5 11:13:56 Macbook-2 mDNSResponder[33]: mDNSResponder mDNSResponder-258.21 (May 26 2011 14:40:13) stopping
Jan  5 11:13:56 Macbook-2 DirectoryService[15]: BUG in libdispatch: 10K549 - 1960 - 0x10004004
Jan  5 11:13:56 Macbook-2 WindowServer[71]: Unable to create event queue via hidd: (0x10000003)
Jan  5 11:13:56 Macbook-2 BBDaemon[49]: rlsCancel notifycancel(): (ipc/mig) server died
Jan  5 11:13:56 Macbook-2 RimAlbumArtDaemon[118]: Exiting
Jan  5 11:14:12 localhost com.apple.launchd[1]: *** launchd[1] has started up. ***
Jan  5 11:14:34 localhost bootlog[45]: BOOT_TIME: 1357395251 0
So many thanks for any help!

Run Repair Disk in Disk Utility after booting with your Install DVDs.
If it does this when booting with the install DVDs you have serious hardware problems.

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    Apr 18 20:16:51 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:17:21: --- last message repeated 1 time ---
    Apr 18 20:17:33 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:18:03: --- last message repeated 1 time ---
    Apr 18 20:18:14 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:18:44: --- last message repeated 1 time ---
    Apr 18 20:18:56 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:19:26: --- last message repeated 1 time ---
    Apr 18 20:19:39 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:20:09: --- last message repeated 1 time ---
    Apr 18 20:20:20 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:20:50: --- last message repeated 1 time ---
    Apr 18 20:21:02 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:21:32: --- last message repeated 1 time ---
    Apr 18 20:21:44 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:22:14: --- last message repeated 1 time ---
    Apr 18 20:22:25 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:22:55: --- last message repeated 1 time ---
    Apr 18 20:23:07 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:23:37: --- last message repeated 1 time ---
    Apr 18 20:23:49 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:24:19: --- last message repeated 1 time ---
    Apr 18 20:24:31 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:25:01: --- last message repeated 1 time ---
    Apr 18 20:25:12 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:25:42: --- last message repeated 1 time ---
    Apr 18 20:25:55 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:26:25: --- last message repeated 1 time ---
    Apr 18 20:26:36 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:27:06: --- last message repeated 1 time ---
    Apr 18 20:27:18 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:27:48: --- last message repeated 1 time ---
    Apr 18 20:28:00 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:28:30: --- last message repeated 1 time ---
    Apr 18 20:28:41 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:29:11: --- last message repeated 1 time ---
    Apr 18 20:29:23 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:29:53: --- last message repeated 1 time ---
    Apr 18 20:30:06 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:30:36: --- last message repeated 1 time ---
    Apr 18 20:30:47 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:31:17: --- last message repeated 1 time ---
    Apr 18 20:31:29 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:31:59: --- last message repeated 1 time ---
    Apr 18 20:32:11 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:32:41: --- last message repeated 1 time ---
    Apr 18 20:32:52 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:33:22: --- last message repeated 1 time ---
    Apr 18 20:33:34 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:34:04: --- last message repeated 1 time ---
    Apr 18 20:34:16 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:34:46: --- last message repeated 1 time ---
    Apr 18 20:34:57 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:35:27: --- last message repeated 1 time ---
    Apr 18 20:35:39 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:36:09: --- last message repeated 1 time ---
    Apr 18 20:36:21 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:36:51: --- last message repeated 1 time ---
    Apr 18 20:37:02 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:37:32: --- last message repeated 1 time ---
    Apr 18 20:37:44 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:38:14: --- last message repeated 1 time ---
    Apr 18 20:38:27 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:38:57: --- last message repeated 1 time ---
    Apr 18 20:39:08 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:39:38: --- last message repeated 1 time ---
    Apr 18 20:39:50 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:40:20: --- last message repeated 1 time ---
    Apr 18 20:40:32 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:41:02: --- last message repeated 1 time ---
    Apr 18 20:41:13 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:41:43: --- last message repeated 1 time ---
    Apr 18 20:41:55 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:42:25: --- last message repeated 1 time ---
    Apr 18 20:42:37 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:43:07: --- last message repeated 1 time ---
    Apr 18 20:43:19 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:43:49: --- last message repeated 1 time ---
    Apr 18 20:44:00 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:44:30: --- last message repeated 1 time ---
    Apr 18 20:44:42 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:45:12: --- last message repeated 1 time ---
    Apr 18 20:45:24 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:45:54: --- last message repeated 1 time ---
    Apr 18 20:46:06 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:46:36: --- last message repeated 1 time ---
    Apr 18 20:46:48 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:47:18: --- last message repeated 1 time ---
    Apr 18 20:47:29 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:47:59: --- last message repeated 1 time ---
    Apr 18 20:48:11 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:48:41: --- last message repeated 1 time ---
    Apr 18 20:48:53 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:49:23: --- last message repeated 1 time ---
    Apr 18 20:49:35 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:50:05: --- last message repeated 1 time ---
    Apr 18 20:50:16 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:50:46: --- last message repeated 1 time ---
    Apr 18 20:51:00 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:51:30: --- last message repeated 1 time ---
    Apr 18 20:51:42 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:52:12: --- last message repeated 1 time ---
    Apr 18 20:52:24 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:52:54: --- last message repeated 1 time ---
    Apr 18 20:53:07 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:53:37: --- last message repeated 1 time ---
    Apr 18 20:53:50 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:54:20: --- last message repeated 1 time ---
    Apr 18 20:54:32 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:55:02: --- last message repeated 1 time ---
    Apr 18 20:55:15 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:55:45: --- last message repeated 1 time ---
    Apr 18 20:55:58 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:56:28: --- last message repeated 1 time ---
    Apr 18 20:56:39 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:57:09: --- last message repeated 1 time ---
    Apr 18 20:57:23 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:57:53: --- last message repeated 1 time ---
    Apr 18 20:58:05 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:58:35: --- last message repeated 1 time ---
    Apr 18 20:58:47 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 20:59:17: --- last message repeated 1 time ---
    Apr 18 20:59:31 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:00:01: --- last message repeated 1 time ---
    Apr 18 21:00:13 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:00:43: --- last message repeated 1 time ---
    Apr 18 21:00:54 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:01:24: --- last message repeated 1 time ---
    Apr 18 21:01:38 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:02:08: --- last message repeated 1 time ---
    Apr 18 21:02:20 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:02:50: --- last message repeated 1 time ---
    Apr 18 21:03:02 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:03:32: --- last message repeated 1 time ---
    Apr 18 21:03:46 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:04:16: --- last message repeated 1 time ---
    Apr 18 21:04:28 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:04:58: --- last message repeated 1 time ---
    Apr 18 21:05:10 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:05:40: --- last message repeated 1 time ---
    Apr 18 21:05:54 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:06:24: --- last message repeated 1 time ---
    Apr 18 21:06:36 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:07:06: --- last message repeated 1 time ---
    Apr 18 21:07:18 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:07:48: --- last message repeated 1 time ---
    Apr 18 21:08:02 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:08:32: --- last message repeated 1 time ---
    Apr 18 21:08:44 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:09:14: --- last message repeated 1 time ---
    Apr 18 21:09:26 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:09:56: --- last message repeated 1 time ---
    Apr 18 21:10:09 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:10:39: --- last message repeated 1 time ---
    Apr 18 21:10:52 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:11:22: --- last message repeated 1 time ---
    Apr 18 21:11:33 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:12:03: --- last message repeated 1 time ---
    Apr 18 21:12:17 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:12:47: --- last message repeated 1 time ---
    Apr 18 21:12:59 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:13:29: --- last message repeated 1 time ---
    Apr 18 21:13:41 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:14:11: --- last message repeated 1 time ---
    Apr 18 21:14:24 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:14:54: --- last message repeated 1 time ---
    Apr 18 21:15:06 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:15:36: --- last message repeated 1 time ---
    Apr 18 21:15:48 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:16:18: --- last message repeated 1 time ---
    Apr 18 21:16:32 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:17:02: --- last message repeated 1 time ---
    Apr 18 21:17:14 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:17:44: --- last message repeated 1 time ---
    Apr 18 21:17:56 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:18:26: --- last message repeated 1 time ---
    Apr 18 21:18:39 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:19:09: --- last message repeated 1 time ---
    Apr 18 21:19:21 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:19:51: --- last message repeated 1 time ---
    Apr 18 21:20:03 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:20:33: --- last message repeated 1 time ---
    Apr 18 21:20:47 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:21:17: --- last message repeated 1 time ---
    Apr 18 21:21:29 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:21:59: --- last message repeated 1 time ---
    Apr 18 21:22:11 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:22:41: --- last message repeated 1 time ---
    Apr 18 21:22:54 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:23:24: --- last message repeated 1 time ---
    Apr 18 21:23:37 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:24:07: --- last message repeated 1 time ---
    Apr 18 21:24:18 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:24:48: --- last message repeated 1 time ---
    Apr 18 21:25:02 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:25:32: --- last message repeated 1 time ---
    Apr 18 21:25:45 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:26:15: --- last message repeated 1 time ---
    Apr 18 21:26:26 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:26:56: --- last message repeated 1 time ---
    Apr 18 21:27:10 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:27:40: --- last message repeated 1 time ---
    Apr 18 21:27:52 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:28:22: --- last message repeated 1 time ---
    Apr 18 21:28:34 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:29:04: --- last message repeated 1 time ---
    Apr 18 21:29:18 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:29:48: --- last message repeated 1 time ---
    Apr 18 21:30:00 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:30:30: --- last message repeated 1 time ---
    Apr 18 21:30:42 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:31:12: --- last message repeated 1 time ---
    Apr 18 21:31:25 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:31:55: --- last message repeated 1 time ---
    Apr 18 21:32:07 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:32:37: --- last message repeated 1 time ---
    Apr 18 21:32:49 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:33:19: --- last message repeated 1 time ---
    Apr 18 21:33:33 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:34:03: --- last message repeated 1 time ---
    Apr 18 21:34:15 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:34:45: --- last message repeated 1 time ---
    Apr 18 21:34:57 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:35:27: --- last message repeated 1 time ---
    Apr 18 21:35:41 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:36:11: --- last message repeated 1 time ---
    Apr 18 21:36:23 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:36:53: --- last message repeated 1 time ---
    Apr 18 21:37:05 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:37:35: --- last message repeated 1 time ---
    Apr 18 21:37:48 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:38:18: --- last message repeated 1 time ---
    Apr 18 21:38:31 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:39:01: --- last message repeated 1 time ---
    Apr 18 21:39:12 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:39:43: --- last message repeated 1 time ---
    Apr 18 21:39:56 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:40:26: --- last message repeated 1 time ---
    Apr 18 21:40:38 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:41:08: --- last message repeated 1 time ---
    Apr 18 21:41:20 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:41:50: --- last message repeated 1 time ---
    Apr 18 21:42:04 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:42:34: --- last message repeated 1 time ---
    Apr 18 21:42:46 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:43:16: --- last message repeated 1 time ---
    Apr 18 21:43:27 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:43:57: --- last message repeated 1 time ---
    Apr 18 21:44:11 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:44:41: --- last message repeated 1 time ---
    Apr 18 21:44:53 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:45:23: --- last message repeated 1 time ---
    Apr 18 21:45:35 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:46:05: --- last message repeated 1 time ---
    Apr 18 21:46:19 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:46:49: --- last message repeated 1 time ---
    Apr 18 21:47:01 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:47:31: --- last message repeated 1 time ---
    Apr 18 21:47:43 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:48:13: --- last message repeated 1 time ---
    Apr 18 21:48:27 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:48:57: --- last message repeated 1 time ---
    Apr 18 21:49:09 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:49:39: --- last message repeated 1 time ---
    Apr 18 21:49:51 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:50:21: --- last message repeated 1 time ---
    Apr 18 21:50:35 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:51:05: --- last message repeated 1 time ---
    Apr 18 21:51:17 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:51:47: --- last message repeated 1 time ---
    Apr 18 21:51:59 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:52:29: --- last message repeated 1 time ---
    Apr 18 21:52:43 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:53:13: --- last message repeated 1 time ---
    Apr 18 21:53:25 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:53:55: --- last message repeated 1 time ---
    Apr 18 21:54:07 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:54:37: --- last message repeated 1 time ---
    Apr 18 21:54:50 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:55:20: --- last message repeated 1 time ---
    Apr 18 21:55:33 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:56:03: --- last message repeated 1 time ---
    Apr 18 21:56:15 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:56:45: --- last message repeated 1 time ---
    Apr 18 21:56:59 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:57:29: --- last message repeated 1 time ---
    Apr 18 21:57:42 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:58:12: --- last message repeated 1 time ---
    Apr 18 21:58:24 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:58:54: --- last message repeated 1 time ---
    Apr 18 21:59:08 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 21:59:38: --- last message repeated 1 time ---
    Apr 18 21:59:51 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:16:35 localhost kernel[0]: npvhash=4095
    Apr 18 23:16:35 localhost kernel[0]: PAE enabled
    Apr 18 23:16:35 localhost kernel[0]: Darwin Kernel Version 10.7.0: Sat Jan 29 15:17:16 PST 2011; root:xnu-1504.9.37~1/RELEASE_I386
    Apr 18 23:16:35 localhost kernel[0]: vm_page_bootstrap: 508834 free pages and 15454 wired pages
    Apr 18 23:16:35 localhost kernel[0]: standard timeslicing quantum is 10000 us
    Apr 18 23:16:35 localhost kernel[0]: mig_table_max_displ = 73
    Apr 18 23:16:35 localhost kernel[0]: AppleACPICPU: ProcessorId=0 LocalApicId=0 Enabled
    Apr 18 23:16:35 localhost kernel[0]: AppleACPICPU: ProcessorId=1 LocalApicId=1 Enabled
    Apr 18 23:16:35 localhost kernel[0]: calling mpo_policy_init for TMSafetyNet
    Apr 18 23:16:35 localhost kernel[0]: Security policy loaded: Safety net for Time Machine (TMSafetyNet)
    Apr 18 23:16:35 localhost kernel[0]: calling mpo_policy_init for Quarantine
    Apr 18 23:16:35 localhost kernel[0]: Security policy loaded: Quarantine policy (Quarantine)
    Apr 18 23:16:35 localhost kernel[0]: calling mpo_policy_init for Sandbox
    Apr 18 23:16:35 localhost kernel[0]: Security policy loaded: Seatbelt sandbox policy (Sandbox)
    Apr 18 23:16:35 localhost kernel[0]: Copyright (c) 1982, 1986, 1989, 1991, 1993
    Apr 18 23:16:35 localhost kernel[0]: The Regents of the University of California. All rights reserved.
    Apr 18 23:16:35 localhost kernel[0]: MAC Framework successfully initialized
    Apr 18 23:16:35 localhost kernel[0]: using 10485 buffer headers and 4096 cluster IO buffer headers
    Apr 18 23:16:35 localhost kernel[0]: IOAPIC: Version 0x20 Vectors 64:87
    Apr 18 23:16:35 localhost kernel[0]: ACPI: System State [S0 S3 S4 S5] (S3)
    Apr 18 23:16:35 localhost kernel[0]: AppleIntelCPUPowerManagement: initialization complete
    Apr 18 23:16:35 localhost kernel[0]: Sleep failure code 0x00000000 0x15000000
    Apr 18 23:16:35 localhost kernel[0]: mbinit: done (64 MB memory set for mbuf pool)
    Apr 18 23:16:35 localhost kernel[0]: rooting via boot-uuid from /chosen: 945EA915-F3BC-3D4E-8246-7CDCD183191A
    Apr 18 23:16:35 localhost kernel[0]: Waiting on <dict ID="0"><key>IOProviderClass</key><string ID="1">IOResources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string></dict>
    Apr 18 23:16:35 localhost kernel[0]: com.apple.AppleFSCompressionTypeZlib kmod start
    Apr 18 23:16:35 localhost kernel[0]: com.apple.AppleFSCompressionTypeZlib load succeeded
    Apr 18 23:16:35 localhost kernel[0]: AppleIntelCPUPowerManagementClient: ready
    Apr 18 23:16:35 localhost kernel[0]: Got boot device = IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/SATA@1F,2/AppleAHCI/PRT2 @2/IOAHCIDevice@0/AppleAHCIDiskDriver/IOAHCIBlockStorageDevice/IOBlockStorageDri ver/ST9100824AS Media/IOGUIDPartitionScheme/Apple_HFS_Untitled_1@2
    Apr 18 23:16:35 localhost kernel[0]: BSD root: disk0s2, major 14, minor 2
    Apr 18 23:16:35 localhost kernel[0]: FireWire (OHCI) Lucent ID 5811 built-in now active, GUID 0016cbfffe58ffea; max speed s400.
    Apr 18 23:16:35 localhost kernel[0]: jnl: unknown-dev: replay_journal: from: 1622528 to: 3194368 (joffset 0x2e9000)
    Apr 18 23:16:35 localhost kernel[0]: jnl: unknown-dev: journal replay done.
    Apr 18 23:16:35 localhost kernel[0]: [Bluetooth::CSRHIDTransition] switchToHCIMode (legacy)
    Apr 18 23:16:35 localhost kernel[0]: [Bluetooth::CSRHIDTransition] transition complete.
    Apr 18 23:16:35 localhost kernel[0]: CSRUSBBluetoothHCIController::setupHardware super returned 0
    Apr 18 23:16:35 localhost kernel[0]: hfs: Removed 2 orphaned / unlinked files and 0 directories
    Apr 18 23:16:35 localhost kernel[0]: AppleYukon2: Marvell Yukon Gigabit Adapter 88E8053 Singleport Copper SA
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    Apr 18 23:16:41 localhost kernel[0]: systemShutdown false
    Apr 18 23:16:42 localhost kernel[0]: Waiting for DSMOS...
    Apr 18 23:17:07 localhost kernel[0]: disk0s2: I/O error.
    Apr 18 23:17:13 localhost kernel[0]: Previous Shutdown Cause: 0
    Apr 18 23:17:13 localhost kernel[0]: Atheros: mac 10.3 phy 6.1 radio 10.2
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    Apr 18 23:17:14 julia-lowes-computer kernel[0]: AirPort: Link Down on en1. Reason 1 (Unspecified).
    Apr 18 23:17:15 julia-lowes-computer kernel[0]: en1: 802.11d country code set to 'US'.
    Apr 18 23:17:15 julia-lowes-computer kernel[0]: en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 36 40 44 48 52 56 60 64 149 153 157 161 165
    Apr 18 23:17:15 julia-lowes-computer kernel[0]: Notice - new kext com.increw.kext.speedit, v0.32 matches prelinked kext but can't determine if executables are the same (no UUIDs).
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    Apr 18 23:17:15 julia-lowes-computer kernel[0]: Supported states
    Apr 18 23:17:15 julia-lowes-computer kernel[0]: AirPort: Link Up on en1
    Apr 18 23:17:16 julia-lowes-computer kernel[0]: AirPort: RSN handshake complete on en1
    Apr 18 23:17:55 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:18:50 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:20:43 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:21:08 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:22:02: --- last message repeated 2 times ---
    Apr 18 23:22:51 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:22:51 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:23:39 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:23:39 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:24:26 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:24:26 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:25:13 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:25:13 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:25:37 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:29:03 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:30:01 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:30:42 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:32:00 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:32:00 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:32:55 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:32:55 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:33:48 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:33:48 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:34:39 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:34:39 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:35:28 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:35:28 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:36:19 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:36:19 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:36:36 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:37:12 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:37:42: --- last message repeated 1 time ---
    Apr 18 23:38:01 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:38:31: --- last message repeated 1 time ---
    Apr 18 23:38:50 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:39:54 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:39:54 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:40:50 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:40:50 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:41:44 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:41:44 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:42:38 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:42:38 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:43:34 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:43:34 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5
    Apr 18 23:44:28 julia-lowes-computer kernel[0]: disk0s2: I/O error.
    Apr 18 23:44:28 julia-lowes-computer kernel[0]: hfs_clonefile: cluster_read failed - 5

    William, Thank you.  I did do the reformat with the DVD SL Disk Utility with the write zeros once option. 
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    Here are 2 threads - https://discussions.apple.com/thread/2673222?threadID=2673222&tstart=180 and http://www.mac-forums.com/forums/apple-notebooks/206962-will-hard-drive-fit-my-m acbook.html
    Do you have an opinion on that?
    I found this one http://www.bestbuy.com/site/Western+Digital+-+Scorpio+Blue+250GB+Internal+Serial +ATA+Hard+Drive+for+Laptops/9024147.p?id=1218012522486&skuId=9024147&st=WDBABB25 00ANC-NRSN&cp=1&lp=1
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    Am I better off buying a genuine apple replacement or an OEM?
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  • Macbook pro 17 starts but then just turns off

    My 17 in macbook pro starts with the chime, shows the apple, but then turns off before it goes any further. This happens whether using just the battery or just the power adaptor or both.
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    I can 'slave' the computer to another working one and see all my data and so forth. But on its own it simply shuts down.
    I have tried starting in 'safe mode' but the same thing happen, with all the same start-up icons and then it shuts down. I have tried holding down command, option and P and R together. Same result.
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    OS X Mavericks- If your computer stops or delays while starting up with progress bar
    OS X v10.6- Gray progress bar appears under Apple logo during startup
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    Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
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    When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
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    OS X Yosemite- Reinstall OS X
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    OS X Mountain Lion- Reinstall OS X
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  • The screen on my macbook has malfunction. When I change the brightness to zero and return to the first level of brightness it works briefly but then the screen starts to flicker brightness and quickly extinguished.

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    Hey everyone in Apple world!
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  • Trying to software update my macbook but after restart it freezes

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    Photoshop Elements
    Adobe ID, Signing In
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    a. For Photoshop Elements technical issues please post your question in the Adobe Photoshop Elements Forum. Somehow your
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    b. Have you verified your Photoshop Elements serial number at the Adobe web site (http://www.adobe.com) - after signing in with your
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