Kernel panic OS X Snow Leopard

Question

Has anyone else experienced this problem? I've had trouble starting up a day.
---start---
panic(cpu 1 caller 0x2abf6a): Kernel trap at 0x0022810d, type 13=general protection, registers:
CR0: 0x8001003b,    CR2:   0x16d4bfb6, CR3: 0x00100000,     CR4: 0x00000660
EAX: 0x086f53d4,     EBX: 0x56c3e000,  ECX: 0x085c5000,     EDX: 0x00847e68
CR2: 0x16d4bfb6,     EPB: 0x5d19bfc8,   ESI: 0x081687c4,     EDI:  0x085c5000  
EFL: 0x00010006,     EIP: 0x0022810d,  CS:   0x00000008,     DS:   0x00910010
Error code: 0x00002ed0
Debugger called: <panic>
Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
0x5d19bdd8     :     0x21b837 (0x5dd7fc 0x5d19be0c 0x223ce1 0x0)
0x5d19be28     :     0x2abf6a (0x59e3d0 0x22810d 0xd 0x59e587)
0x5d19bf08      :     0x2a1a78 (0x5d19bf20 0x27a317eb 0x5d19bfc8 0x22810d)
0x5d19bf18      :     0x22810d (0xe 0x56c30048 0x81150010 0x10)
0x5d19bfc8      :     0x2a179c (0c0 0cffffffff 0x2a17ab 0x81687a8)
BSD process name corresponding to current thread: kernel_task
Mac OS version:
10K549
Kernel version:
Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386
System model name: iMac8,1 (Mac-F226BEC8)
System uptime in nanoseconds: 58151261649
---end---
I have attempted restarting after each of the following without any success - most of the time hanging at 'system uptime in nanoseconds: xxxxxx)
1. Disconnected & reconnected power cord
2. Removed all cords, leaving only Apple keyboard and mouse connected
3. Reset PRAM (Cmd+Alt+p+r)
4. Safe boot (Shift)
5. Verbose (Cmd+V) - there were two error messages (below), hanging at 'waiting for remote debugger connection. kdp_poll: no debugger device'
     Error 1
          Error 2 registering socket filter (com.symantec.fw.ac.at). Your computer may not be fully protected
          Application Control encountered an error while initializing. Your computer will not be fully protected.
       Error 2
          Running fsck on the boot volum...
          Executing fsck_hsf (version diskdev_cmds-491, 6~3).
     ** Checking Journaled HFS Plus volume.
     ** Checking extents overflow file.
     ** Checking catalog file.
          Incorrect block count for file live.0.indexArrays
          (It should be 7038 instead of 3519)
6. Boot from original DVD (separate attempts, C and Option) - can't reach the Disk Utilitym, stalling on grey screen
7. Single user (Cmd+S) - 3 beeps and repeats
Any assistance would be greatly appreciated. Thanks.

Answer 1

Please post the complete Kernel Panic log you can find it at:
/Library/Logs/DiagnosticReports
Once you post it we can get a good idea.
I'm getting the idea though yours is cause by RAM primarily based on your comment in #7. "Single user (Cmd+S) - 3 beeps and repeats"
Here is what Apple says about 3 beeps on startup in http://support.apple.com/kb/ht1547
The RAM issues can be:
1. failed RAM, yes it can & does fail
2. Incorrect RAM, did you upgrade recently?
3. Unseated RAM, remove and reseat as needed.
Also here are some KP troubleshooting articles:
Kernel Panics
Mac OS X 10.6 Help: If “You need to restart your computer” appears
How to log a kernel panic
Tutorial: Avoiding and eliminating Kernel panics