2006 iMAC intel core duo Kernel Panic + Black Curtain of Death

I've had this iMAC since 2006 w/o a problem. Lately been getting the "curtain of death" and screen to restart the computer. Saw similar discussions about these Kernel Panics. Brought the iMAC to Apple Store and tech thought it was a bad logic board and recommended not to fix it ($800+). I have trouble, as did the tech getting it to boot. Today I got it to boot and before it crashed again, I managed to run the Hardware Test from the original OS disc 1. This showed no problem in both tests. Did get the panic log (see below) can anyone make heads or tails of this? Thanks
Thu Mar 31 16:24:35 2011
panic(cpu 1 caller 0x00191BE8): pmap-remove: mapping not in pv_list!
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x1422b368 : 0x128d0d (0x3cc65c 0x1422b38c 0x131f95 0x0)
0x1422b3a8 : 0x191be8 (0x3cf8c0 0x0 0x1422b3d8 0x6)
0x1422b428 : 0x193fc8 (0x242df818 0x242dfc18 0x0 0x19ae76)
0x1422b478 : 0x16550c (0x2f5f3a0 0xb0103000 0x0 0xb0183000)
0x1422b568 : 0x165cc0 (0xffe00000 0x0 0x0 0x0)
0x1422b5a8 : 0x13a98b (0x325a950 0x0 0x0 0xffe00000)
0x1422b5f8 : 0x36ecff (0x3308380 0x1000 0x0 0xf350)
0x1422b688 : 0x339740 (0x1422b9a4 0x25482000 0x31a343c 0x0)
0x1422b948 : 0x338c90 (0x1422b9a4 0x30bece4 0x25482000 0x1000)
0x1422bf58 : 0x37b300 (0x330e5dc 0x302e5c8 0x302e60c 0x0)
0x1422bfc8 : 0x19b77e (0x30c60e4 0x0 0x19e0b5 0x30c60e4) No mapping exists for frame pointer
Backtrace terminated-invalid frame pointer 0xb0182af8
Kernel version:
Darwin Kernel Version 8.11.1: Wed Oct 10 18:23:28 PDT 2007; root:xnu-792.25.20~1/RELEASE_I386
Thu Mar 31 18:59:15 2011
panic(cpu 1 caller 0x001A49CB): Unresolved kernel trap (CPU 1, Type 14=page fault), registers:
CR0: 0x8001003b, CR2: 0x00000013, CR3: 0x00e7b000, CR4: 0x000006e0
EAX: 0x00000001, EBX: 0xffffffff, ECX: 0x042e0a2c, EDX: 0x03be8a18
CR2: 0x00000013, EBP: 0x251abc28, ESI: 0x36c09000, EDI: 0x00000000
EFL: 0x00010286, EIP: 0x0017eac6, CS: 0x00000008, DS: 0x251a0010
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x251aba58 : 0x128d0d (0x3cc65c 0x251aba7c 0x131f95 0x0)
0x251aba98 : 0x1a49cb (0x3d2a94 0x1 0xe 0x3d22b8)
0x251abba8 : 0x19b3a4 (0x251abbb8 0x0 0xe 0x190048)
0x251abc28 : 0x167082 (0x3be8a18 0x36c09000 0x0 0x202)
0x251abca8 : 0x167617 (0x40c1000 0x276000 0xff0000 0x683518c)
0x251abd18 : 0x18480f (0x40c1000 0x251abd48 0x251abd40 0xb)
0x251abd58 : 0x155eba (0x40c1000 0x40073c0 0x423c69c 0xb)
0x251abdb8 : 0x12b4ee (0x40073a0 0x423c668 0x0 0x0)
0x251abdf8 : 0x124b17 (0x4007300 0x0 0x2c 0x251abedc)
0x251abf08 : 0x195f2e (0x251abf44 0x0 0x0 0x0)
0x251abfc8 : 0x19b81e (0x42792d4 0x0 0x19e0b5 0x42e1b20) No mapping exists for frame pointer
Backtrace terminated-invalid frame pointer 0xbffff838
Kernel version:
Darwin Kernel Version 8.11.1: Wed Oct 10 18:23:28 PDT 2007; root:xnu-792.25.20~1/RELEASE_I386
Thu Mar 31 19:49:26 2011
panic(cpu 0 caller 0x001A49CB): Unresolved kernel trap (CPU 0, Type 14=page fault), registers:
CR0: 0x80010033, CR2: 0xeeeeef02, CR3: 0x00e71000, CR4: 0x000006e0
EAX: 0x00000001, EBX: 0xeeeeeeee, ECX: 0x0473e2c0, EDX: 0x04500cc0
CR2: 0xeeeeef02, EBP: 0x252e3df8, ESI: 0x00709000, EDI: 0x00000000
EFL: 0x00010286, EIP: 0x0017eac6, CS: 0x00000008, DS: 0x252e0010
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x252e3c28 : 0x128d0d (0x3cc65c 0x252e3c4c 0x131f95 0x0)
0x252e3c68 : 0x1a49cb (0x3d2a94 0x0 0xe 0x3d22b8)
0x252e3d78 : 0x19b3a4 (0x252e3d88 0x0 0xe 0x48)
0x252e3df8 : 0x160971 (0x4500cc0 0x709000 0x0 0x1)
0x252e3f48 : 0x1a4c3e (0x4e10c78 0xa32a9000 0x0 0x1)
0x252e3fc8 : 0x19b2d4 (0x46b5468 0x19b2c5 0x8 0x46b5468) No mapping exists for frame pointer
Backtrace terminated-invalid frame pointer 0xbffff9a8
Kernel version:
Darwin Kernel Version 8.11.1: Wed Oct 10 18:23:28 PDT 2007; root:xnu-792.25.20~1/RELEASE_I386

If you attempt to boot from an external HD that is set up as a bootable clone and it fails to boot that almost certainly points to the Mac having a hardware. The bootable clone would have had to be setup prior to the failure. Many people (myself included) keep redundant backups, I would recommend doing the same when you have either repaired or replaced the current machine. Macworld runs articles where users describe their own backup strategies, I'd recommend reading them and then deciding which works best for your needs.
http://www.macworld.com/article/157414/2011/02/mybackupplanlex.html
http://www.macworld.com/article/156643/2011/01/howi_back_up_frakes.html?lsrc=top1
http://www.macworld.com/article/141363/2009/07/backup.html
Roger

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