> > On Nov 19, 2011, at 9:50 PM, JohnCarmonne wrote: > >> >> On Nov 19, 2011, at 9:15 PM, Amanda Ward wrote: >> >>> Hi All… >>> >>> Recently I've had problems with files I've downloaded not opening because >>> the file is "corrupted" or has an "invalid checksum". Also found files that >>> I've downloaded in the past and successfully installed are now corrupted, >>> etc, etc… >>> Most recently the backlog of updates from software update have failed to >>> open. >>> >>> I have no clue of what is causing this. Any advice will be greatly >>> appreciated. >>> >>> Amanda >>> >>> Model Name: iMac >>> Model Identifier: iMac8,1 >>> Processor Name: Intel Core 2 Duo >>> Processor Speed: 2.4 GHz >>> Number of Processors: 1 >>> Total Number of Cores: 2 >>> L2 Cache: 6 MB >>> Memory: 4 GB >>> Bus Speed: 1.07 GHz >>> Boot ROM Version: IM81.00C1.B00 >>> SMC Version (system): 1.29f1 >>> OS 10.7.1 >>> >> To begin with I'd run permissions repair and DiskWarrior just to get that >> out of the way. >> On Dec 2, 2011, at 3:16 PM, Amanda Ward wrote:
> Thanks to John and Jim for their response!!! > > What I've done since my first post: > > Ran disk utilities. Found 1 permission error in an iTunes directory. Repaired > that. Verify disk reported no errors. > > Then I nuked and reinstalled just the OS (10.6). Tried to update to 10.6.8. > "Cannot expand the file. The file may have been corrupted" > > Re-nuked and reinstalled just the OS. Tried to update from a file downloaded > on another computer. "Cannot expand the file. The file may have been > corrupted" > > Re-nuked and reinstalled just the OS. Ran Drive Genius 3 verify. "Disk > appears to be okay". DG 3 scan found no bad blocks. > > Re-nuked and reinstalled the OS. Restored from the earliest Time Machine > Backup. Still the same problems. Ran Disk Warrior 4.3. Smart status was okay. > There were directory errors… rebuilt and replaced. There were file errors > reported, but I'm not sure what DW did about them. Still the same problems. > Files are corrupted or have invalid checksums. > > I dunno!?!?! > > Amanda > Hmmm. Drive Genius 3 verify is the same as running Disk Utility's verify. Did you run the DG3 Integrity Checks (read and write, random and sustained)? I've found that hard drives that start getting wonky but will pass a verify check and a bad sector scan sometimes have read and/or write problems, especially slowdowns. Run the DG3 tests for hours. That should ferret out any read/write problems. If not, then something is causing your 10.6.8 update downloads to be corrupted. Try getting the download through a Mac at a friend/relative's house. Are you downloading to an external drive or to a thumb drive: maybe that's where your problem lies? Or it could be a USB or firewire port/bus problem. You did try purging caches by starting in Safe Mode (hold down shift key a looooonnnnggggg time)? Have you tried AppleJack 1.6 for Snow Leopard? It's also got a very thorough deep clean of caches option that may do the trick. Neither one should be necessary if you've done a proper nuke and pave with a clean OS install, but without using Migration Assistant or Time Machine to import any of your "other" apps and data. What I find puzzling though is that a nuke and pave with 10.6 works OK, but the problem occurs when you try to update to 10.6.8. Does the problem occur if you run other 10.6 updates, but not the 10.6.xx update? Have you tried using another user account set up as administrator? Do a nuke and pave of the OS only, then run the 10.6.8 download update as that test user. Good luck! Jim Scott -- You received this message because you are a member of the iMac Group, a group for those using Apple iMacs and eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/imaclist
