Older Intel iMac Freezing/Locking Up

Most of the reports of iMacs freezing/locking up seem to be coming from owners of the new aluminum models, but my "first generation" (early 2006) 20" Intel iMac recently began exhibiting the same problem after having performed flawlessly for me from the time of its purchase.
That leads me to believe the root cause is more likely to be a software glitch than a hardware issue...but, wherever the trouble lays, I wish Apple would get it sorted out soon!
After four days of repeated freezes/lockups, I got so frustrated trying to troubleshoot the problem myself that I finally contacted an Apple-authorized repair service for help; my machine's now been in the shop for over three weeks, and the tech there has had no better luck in pinning down the case or finding a fix than what I'd had.
At the urging of another iMac user who's posted on this subject elsewhere in this forum, I've submitted feedback to Apple, suggesting that the company needs to recognize that this is a fairly widespread problem which is affecting older iMacs as well as the new, and urging the company to take it more seriously than what it seems to have been doing up until now.

The Update 1.1 was apparently for aluminum models only, so it wouldn't have been installed on my machine. And, while the technique you've described as working for you has worked for some people who've tried it, it hasn't solved the problem for others.
My guess is that a bad bit of code somewhere in OS 10.4.xx itself is at the root of the problem; maybe it just sat benignly, causing no problems, until some particuar driver or security or application update with incompatible code got installed and caused a conflict.

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    http://forum.insanelymac.com/index.php?s=573add15ab69f13bca29cd52c5eef5ab&showto pic=20139&st=300&p=142776&#entry142776
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    panic(cpu 0 caller 0x0019075E): pmap-remove: mapping not in pv_list!
    Backtrace, Format - Frame : Return Address (4 potential args on stack)
    0x13f5bc18 : 0x128d08 (0x3c9ac4 0x13f5bc3c 0x131de5 0x0)
    0x13f5bc58 : 0x19075e (0x3ccc58 0xa0000000 0x0 0x1a2010)
    0x13f5bcb8 : 0x1937d7 (0xddd000 0xddd050 0x0 0x19a406)
    0x13f5bd08 : 0x16535c (0x252d420 0xa0000000 0x0 0xa000a000)
    0x13f5bdf8 : 0x165b10 (0xffe00000 0x0 0x0 0x0)
    0x13f5be38 : 0x13a676 (0x13000c8 0x0 0x0 0xffe00000)
    0x13f5be88 : 0x339160 (0x2529a30 0x202 0x13f5bee8 0x2529a30)
    0x13f5bec8 : 0x343614 (0x2b725dc 0xa 0x0 0x0)
    0x13f5bee8 : 0x343d3f (0x2b725dc 0xa 0x0 0x0)
    0x13f5bf58 : 0x343f25 (0xa 0x1 0x13f5bf78 0x2416e038)
    0x13f5bf78 : 0x1273f9 (0x2544a10 0xffffff7f 0x0 0x4)
    0x13f5bfa8 : 0x1a1f8d (0xffffffff 0x1 0x0 0x253b500)
    0x13f5bfc8 : 0x19a896 (0x0 0x0 0x19d0b5 0x253b500) Backtrace terminated-invalid frame pointer 0x13f5bef8
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    Size: 8.5 KB
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    W [07/Aug/2007:15:49:07 -0400] Repairing ownership of "/private/etc/cups/ppd"
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    W [07/Aug/2007:15:49:07 -0400] Repairing ownership of "/private/etc/cups/classes.conf"
    W [07/Aug/2007:15:49:07 -0400] Repairing ownership of "/private/etc/cups/printers.conf"
    W [07/Aug/2007:15:49:07 -0400] Repairing ownership of "/private/var/spool/cups"
    W [07/Aug/2007:15:49:07 -0400] Repairing ownership of "/private/var/spool/cups/tmp"
    I [07/Aug/2007:15:49:07 -0400] Configured for up to 100 clients.
    I [07/Aug/2007:15:49:07 -0400] Allowing up to 100 client connections per host.
    I [07/Aug/2007:15:49:07 -0400] Full reload is required.
    I [07/Aug/2007:15:49:07 -0400] Full reload complete.
    I [07/Aug/2007:15:49:21 -0400] Setting AdobePDF8 device-uri to "pdf800://distiller/" (was "file:/dev/null".)
    I [07/Aug/2007:15:49:21 -0400] Saving printers.conf...
    I [07/Aug/2007:15:49:21 -0400] New printer 'AdobePDF8' added by ''.
    I [07/Aug/2007:15:49:21 -0400] Saving printers.conf...
    I [07/Aug/2007:15:49:21 -0400] Printer 'AdobePDF8' modified by ''.
    I [07/Aug/2007:15:49:21 -0400] Setting AdobePDF8 printer-is-accepting-jobs to 1 (was 0.)
    I [07/Aug/2007:15:49:21 -0400] Setting AdobePDF8 printer-state to 3 (was 5.)
    I [07/Aug/2007:15:49:21 -0400] Saving printers.conf...
    I [07/Aug/2007:15:49:21 -0400] Printer 'AdobePDF8' modified by ''.
    I [07/Aug/2007:15:49:21 -0400] Saving printers.conf...
    I [07/Aug/2007:15:49:21 -0400] Printer 'AdobePDF8' modified by ''.
    I [07/Aug/2007:16:35:22 -0400] Scheduler shutting down normally.
    I [07/Aug/2007:21:22:15 -0400] Listening to 7f000001:631
    I [07/Aug/2007:21:22:15 -0400] Listening to 700c3000:0
    I [07/Aug/2007:21:22:15 -0400] Loaded configuration file "/private/etc/cups/cupsd.conf"
    W [07/Aug/2007:21:22:15 -0400] Repairing ownership of "/private/etc/cups"
    W [07/Aug/2007:21:22:15 -0400] Repairing ownership of "/private/etc/cups/certs"
    W [07/Aug/2007:21:22:15 -0400] Repairing ownership of "/private/etc/cups/ppd"
    W [07/Aug/2007:21:22:15 -0400] Repairing ownership of "/private/etc/cups/cupsd.conf"
    W [07/Aug/2007:21:22:15 -0400] Repairing ownership of "/private/etc/cups/classes.conf"
    W [07/Aug/2007:21:22:15 -0400] Repairing ownership of "/private/etc/cups/printers.conf"
    W [07/Aug/2007:21:22:15 -0400] Repairing ownership of "/private/var/spool/cups"
    W [07/Aug/2007:21:22:15 -0400] Repairing ownership of "/private/var/spool/cups/tmp"
    I [07/Aug/2007:21:22:15 -0400] Configured for up to 100 clients.
    I [07/Aug/2007:21:22:15 -0400] Allowing up to 100 client connections per host.
    I [07/Aug/2007:21:22:15 -0400] Full reload is required.
    I [07/Aug/2007:21:22:15 -0400] Full reload complete.
    I [07/Aug/2007:21:22:16 -0400] Printer sharing is off and there are no jobs pending, will restart on demand. Exiting.
    I [07/Aug/2007:21:28:43 -0400] Listening to 7f000001:631
    I [07/Aug/2007:21:28:43 -0400] Listening to 700c3000:0
    I [07/Aug/2007:21:28:43 -0400] Loaded configuration file "/private/etc/cups/cupsd.conf"
    I [07/Aug/2007:21:28:43 -0400] Configured for up to 100 clients.
    I [07/Aug/2007:21:28:43 -0400] Allowing up to 100 client connections per host.
    I [07/Aug/2007:21:28:43 -0400] Full reload is required.
    I [07/Aug/2007:21:28:43 -0400] Full reload complete.
    I [07/Aug/2007:21:28:43 -0400] Printer sharing is off and there are no jobs pending, will restart on demand. Exiting.
    I [08/Aug/2007:00:00:06 -0400] Listening to 7f000001:631
    I [08/Aug/2007:00:00:06 -0400] Listening to 40113000:0
    I [08/Aug/2007:00:00:06 -0400] Loaded configuration file "/private/etc/cups/cupsd.conf"
    I [08/Aug/2007:00:00:06 -0400] Configured for up to 100 clients.
    I [08/Aug/2007:00:00:06 -0400] Allowing up to 100 client connections per host.
    I [08/Aug/2007:00:00:06 -0400] Full reload is required.
    I [08/Aug/2007:00:00:06 -0400] Full reload complete.
    I [08/Aug/2007:00:00:06 -0400] Printer sharing is off and there are no jobs pending, will restart on demand. Exiting.
    I [08/Aug/2007:00:12:01 -0400] Listening to 7f000001:631
    I [08/Aug/2007:00:12:01 -0400] Listening to 40113000:0
    I [08/Aug/2007:00:12:01 -0400] Loaded configuration file "/private/etc/cups/cupsd.conf"
    I [08/Aug/2007:00:12:01 -0400] Configured for up to 100 clients.
    I [08/Aug/2007:00:12:01 -0400] Allowing up to 100 client connections per host.
    I [08/Aug/2007:00:12:01 -0400] Full reload is required.
    I [08/Aug/2007:00:12:01 -0400] Full reload complete.
    I [08/Aug/2007:00:12:01 -0400] Printer sharing is off and there are no jobs pending, will restart on demand. Exiting.
    I [08/Aug/2007:00:19:06 -0400] Listening to 7f000001:631
    I [08/Aug/2007:00:19:06 -0400] Listening to 40113000:0
    I [08/Aug/2007:00:19:06 -0400] Loaded configuration file "/private/etc/cups/cupsd.conf"
    I [08/Aug/2007:00:19:06 -0400] Configured for up to 100 clients.
    I [08/Aug/2007:00:19:06 -0400] Allowing up to 100 client connections per host.
    I [08/Aug/2007:00:19:06 -0400] Full reload is required.
    I [08/Aug/2007:00:19:06 -0400] Full reload complete.
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    Thanks for the reply and links!
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  • Email on my older 24" intel iMac

    my email goes to 3 of my 4 mac products: (iphone 4s, ipad, & macbook pro)  so i can see & or respond no matter what mac product i am using.
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