Lion resets/reboots after sleep

[semenzato]

Greetings,

I have a mid-2007 iMac with 4GB RAM and Mac OS Lion 10.7.5. When the iMac goes to sleep for a long time (let's say 2 hours or longer, but I haven't attempted to measure this interval precisely), when I wake it up using the keyboard (<return>), the iMac immediately reboots instead of waking up. The kernel log shows nothing:

Jan 1 15:13:42 luigi-semenzatos-computer-2 kernel[0]: [ffffff800b5e0700][AppleMultitouchDevice::start] entered
Jan 1 15:14:05 bar kernel[0]: jnl: disk1s3: replay_journal: from: 56361472 to: 57707520 (joffset 0x1d1e000)
Jan 1 15:14:05 bar kernel[0]: jnl: disk1s3: journal replay done.
Jan 1 15:14:07 bar kernel[0]: CODE SIGNING: cs_invalid_page(0x1000): p=177[ksadmin] clearing CS_VALID
Jan 1 15:14:15 bar kernel[0]: CODE SIGNING: cs_invalid_page(0x1000): p=205[ksadmin] clearing CS_VALID
Jan 1 15:14:22 bar kernel[0]: CODE SIGNING: cs_invalid_page(0x1000): p=225[GoogleSoftwareUp] clearing CS_VALID
Jan 1 15:14:29 bar kernel[0]: CODE SIGNING: cs_invalid_page(0x1000): p=252[ksadmin] clearing CS_VALID
Jan 1 15:14:29 bar kernel[0]: CODE SIGNING: cs_invalid_page(0x1000): p=253[ksadmin] clearing CS_VALID
Jan 1 20:56:10 localhost kernel[0]: Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64
Jan 1 20:56:10 localhost kernel[0]: vm_page_bootstrap: 1009715 free pages and 30669 wired pages
Jan 1 20:56:10 localhost kernel[0]: kext submap [0xffffff7f80736000 - 0xffffff8000000000], kernel text [0xffffff8000200000 - 0xffffff8000736000]
Jan 1 20:56:10 localhost kernel[0]: zone leak detection enabled

The device works fine otherwise.

Could this be a memory corruption problem? I think the machine came with 1 GB, then I added another one, then I replaced both modules with 2 GB modules.

Any suggestion is welcome.

Thanks!
Luigi

[anthlover]

I have seen that behavior when the Hard Drive is going bad.

***You did not mention when you installed the memory or updated the to LI relative to when the problem began and that would be key information.

Do you have back ups? Preferably bootable ones like from CCC or Superduper.