Mac Pro Kernel Panic while booted on install disk

Question

I have a Mac Pro with 1 year and 2 weeks on the clock. No Apple Care.
Started getting intermittent Kernel Panics about 2 weeks ago, which are becoming a real problem now. Happening every time I use the machine.
I’m running 10.6.4 and just have the original ram etc.
Having searched here for related topics, I have been trying to troubleshoot the situation.
Was looking at recent software installs or likely culprits...
Ran the normal Apple Hardware Test and passed ok.
Ran an extended test and got this error: "4HDD/11/40000004:SATA(4,0)
Repaired all internal disks as far as possible, while started up on the installation disk, and when finished I got another Kernel Panic, while still running on the disk.
Can someone confirm if this means the issue if definitely hardware rather than software?
If so is it possible to tell which hard drive is at fault - ie. which Bay number corresponds to the SATA error above, if it is the hard drives at fault?
Need to get this fixed asap, so if anyone has any thoughts on how I should best proceed, that would be really appreciated. Thanks.
Here is the Report from the last Panic:
Sun Oct 3 21:30:03 2010
Machine-check capabilities (cpu 1) 0x0000000000001c09:
family: 6 model: 26 stepping: 5 microcode: 17
Intel(R) Xeon(R) CPU E5520 @ 2.27GHz
9 error-reporting banks
threshold-based error status present
extended corrected memory error handling present
Machine-check status 0x0000000000000004:
machine-check in progress
MCA error-reporting registers:
IA32MC0STATUS(0x401): 0x0000000000000800 invalid
IA32MC1STATUS(0x405): 0x0000000000000800 invalid
IA32MC2STATUS(0x409): 0xb200000000030005 valid
MCA error code: 0x0005
Model specific error code: 0x0003
Other information: 0x00000000
Threshold-based status: No tracking
Status bits:
Processor context corrupt
Error enabled
Uncorrected error
IA32MC3STATUS(0x40d): 0x0000000000000000 invalid
IA32MC4STATUS(0x411): 0x0000000000000000 invalid
IA32MC5STATUS(0x415): 0x0000000000000000 invalid
IA32MC6STATUS(0x419): 0x0000000000000000 invalid
IA32MC7STATUS(0x41d): 0x0000000000000000 invalid
Package 0 logged:
IA32MC8STATUS(0x421): 0x0000000000000000 invalid
Package 1 logged:
IA32MC8STATUS(0x421): 0x0000000000000000 invalid
panic(cpu 1 caller 0x001A9A3E): Machine Check at 0x857d48aa, thread:0x996c3c8, trapno:0x12, err:0x0, registers:
CR0: 0x8001003b, CR2: 0xb0091fec, CR3: 0x00ec6000, CR4: 0x00000660
EAX: 0x09c2c000, EBX: 0x000003e8, ECX: 0x00088d80, EDX: 0x00000000
ESP: 0x85b9bebc, EBP: 0x85b9bec8, ESI: 0x098e1000, EDI: 0x0000091e
EFL: 0x00000206, EIP: 0x857d48aa
Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
0x84eaffb8 : 0x12b4c3 (0x45d7fc 0x84eaffec 0x133542 0x0)
0x84eb0008 : 0x1a9a3e (0x467558 0x857d48aa 0x996c3c8 0x12)
0x84eb00e8 : 0x1a15c3 (0x84eb0100 0x401ff4ab 0x803fe956 0x7fd2ad)
0x85b9bec8 : 0x857d4c0a (0x98e1000 0x9c2c000 0x0 0x41047c)
0x85b9bee8 : 0x857cd96c (0x98e1000 0x0 0x85b9bf18 0x857cda50)
0x85b9bf18 : 0x424b61 (0x98e1000 0x0 0x1 0x19ef34)
0x85b9bf68 : 0x423cbe (0x99f2580 0x996c3c8 0x85b9bf98 0x136e83)
0x85b9bf98 : 0x4239a0 (0x9988a40 0x9988a40 0x85b9bfc8 0x126313)
0x85b9bfc8 : 0x1a055c (0x9988a40 0x0 0x1a30b5 0xa75fb40)
Backtrace terminated-invalid frame pointer 0
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AppleUSBEHCI(3.4.0)@0x857ca000->0x857dbfff
dependency: com.apple.iokit.IOUSBFamily(3.4.0)@0x85664000
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x77db9000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
9G3553
Kernel version:
Darwin Kernel Version 9.6.3: Tue Jan 20 18:26:40 PST 2009; root:xnu-1228.10.33~1/RELEASE_I386
System model name: MacPro4,1 (Mac-F221BEC8)
Message was edited by: kmahon

Answer 1

Hi experiencing simular issues
Initially I thought the error was related to too many different things on the machine, but have since done a clean install to 10.6 with FCP and CS4 only and the and the errors continue.
6 error-reporting banks referred to 6 of the ram chips, but i see that your report
states 9, ( you don't have 9 ram slots do you?)
Upgraded this of a volume disc so I don't have the hardware diagnostic for this machine on a disc, and would have to go back to the tiger hardware diagnostics which should not make a difference but I see on forums people claiming this is an error only with leopard and that their systems were fine under tiger. The ram has a life time warrantee (non apple) but I need to get it to fail a test other than this apple problem report.
The machine crashes are not software specific, I was hand writing with just a browser open and it requested that I would have to restart the machine. If would be easier to test any solution I I know that combo would crash the machine other than time.
I expect the next steps
are to reseat the ram
reset the p-ram
Regards
Colm