HT3964 Imac shuts down after start up

New hard drive in Imac when I power it on goes throught the process and then it shuts down, I have new memory as well.

Your capacitors are leaking, this is a known issue with Rev A G5 iMacs, and they should be replaced, along with the logic board. Take it in and if t stays up long enough, try to clone it to an external drive to save your data. I use SuperDuper! to do this.
Let us know how you make out,

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    Several logs in the info file , this is the "panic.log"
    Description: Panic (system crashes) log
    Size: 3.92 KB
    Last Modified: 19/01/2007 13:07
    Location: /Library/Logs/panic.log
    Recent Contents: Mon May 15 08:04:42 2006
    panic(cpu 0 caller 0x0019CAEF): Unresolved kernel trap (CPU 0, Type 14=page fault), registers:
    CR0: 0x80010033, CR2: 0xe000038b, CR3: 0x01632000, CR4: 0x000006e0
    EAX: 0xe00002e7, EBX: 0x03a67283, ECX: 0x03a67283, EDX: 0x032a5000
    ESP: 0xe000038b, EBP: 0x0be1bd08, ESI: 0x0327a48c, EDI: 0x032a0800
    EFL: 0x00010213, EIP: 0x268874d4, CS: 0x00000008, DS: 0x00000010
    Backtrace, Format - Frame : Return Address (4 potential args on stack)
    0xbe1bbc0 : 0x128b5e (0x3bbeb8 0xbe1bbe4 0x131bbc 0x0)
    0xbe1bc00 : 0x19caef (0x3c1340 0x0 0xe 0x3c10f8)
    0xbe1bcb0 : 0x197b53 (0xbe1bcc4 0xbe1bd08 0x268874d4 0x48)
    0xbe1bcbc : 0x268874d4 (0x48 0x2e70010 0x32a0010 0x10)
    0xbe1bd08 : 0x268895fa (0x27f3000 0x3a67283 0xbe1bd38 0x3ae082)
    0xbe1bd38 : 0x3a3045 (0x32a0800 0x3a67283 0x327a48c 0x327a490)
    0xbe1bd88 : 0x18a1e5 (0x32a0800 0x6 0x35b0ec4 0x1)
    0xbe1bdd8 : 0x12b389 (0x35b0e9c 0x327a464 0x0 0x0)
    0xbe1be18 : 0x124902 (0x35b0e00 0x0 0x30 0xbe1befc)
    0xbe1bf28 : 0x192efc (0xbe1bf54 0x0 0x0 0x0)
    0xbe1bfd8 : 0x197fa6 (0x2f7d920 0x2f7d920 0x3a67283 0xe000038b) No mapping exists for frame pointer
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    com.apple.ATIRadeonX1000(4.2.6)@0x26882000
    dependency: com.apple.iokit.IOPCIFamily(2.0)@0x1be85000
    dependency: com.apple.iokit.IOGraphicsFamily(1.4.3)@0x2683d000
    dependency: com.apple.iokit.IONDRVSupport(1.4.3)@0x26873000
    Kernel version:
    Darwin Kernel Version 8.6.1: Tue Mar 7 16:55:45 PST 2006; root:xnu-792.9.22.obj~1/RELEASE_I386
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    panic(cpu 1 caller 0x0019CADF): Unresolved kernel trap (CPU 1, Type 14=page fault), registers:
    CR0: 0x8001003b, CR2: 0xa3a22088, CR3: 0x00d1d000, CR4: 0x000006a0
    EAX: 0x09d11044, EBX: 0x02c5bc04, ECX: 0x01b03000, EDX: 0x0296a000
    ESP: 0xa3a22088, EBP: 0x0b443b84, ESI: 0x02c5bc14, EDI: 0x00000000
    EFL: 0x00010282, EIP: 0x01c990ab, CS: 0x00000008, DS: 0x00000010
    Backtrace, Format - Frame : Return Address (4 potential args on stack) Unaligned frame
    Backtrace terminated-invalid frame pointer 0xb4439ef
    Kernel version:
    Darwin Kernel Version 8.7.1: Wed Jun 7 16:19:56 PDT 2006; root:xnu-792.9.72.obj~2/RELEASE_I386
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    panic(cpu 0 caller 0x001A3135): Unresolved kernel trap (CPU 0, Type 14=page fault), registers:
    CR0: 0x8001003b, CR2: 0x00000000, CR3: 0x00db2000, CR4: 0x000006e0
    EAX: 0x02f92000, EBX: 0x01f4df8c, ECX: 0x01f4df94, EDX: 0x020a1ec0
    CR2: 0x00000000, EBP: 0x0b6abe38, ESI: 0x0068bcc8, EDI: 0x02159480
    EFL: 0x00010202, EIP: 0x00000000, CS: 0x00000008, DS: 0x1ff40010
    Backtrace, Format - Frame : Return Address (4 potential args on stack)
    0xb6abc78 : 0x128d1f (0x3c9540 0xb6abc9c 0x131df4 0x0)
    0xb6abcb8 : 0x1a3135 (0x3cf1f4 0x0 0xe 0x3cea24)
    0xb6abdc8 : 0x19a8d4 (0xb6abdd4 0xe 0x2570048 0x2f20010)
    0xb6abe38 : 0x67c92b (0x1f4df8c 0x68bcc8 0xb6abe78 0x2f24e00)
    0xb6abe58 : 0x67c9a0 (0x2f24e00 0x1f4df8c 0xb6abe98 0x3bdf77)
    0xb6abe78 : 0x1ff4e7dc (0x2f24e00 0x1c08cc0 0x1e71300 0x2f24e00)
    0xb6abe98 : 0x38748a (0x2f24e00 0x2f0dc00 0x5 0x199c36)
    0xb6abed8 : 0x397b17 (0x2f0dc00 0x5 0x2f2fd80 0x0)
    0xb6abf08 : 0x387340 (0x1d5ae80 0x3873e4 0x2f0dc00 0x5)
    0xb6abf58 : 0x38adf6 (0x2f2fd80 0x0 0x0 0x0)
    0xb6abfa8 : 0x38b21d (0x5 0x38b1fc 0x5 0x4b7000)
    0xb6abfc8 : 0x19a74c (0x5 0x0 0x19d0b5 0x1d89b70) Backtrace terminated-invalid frame pointer 0x0
    Kernel loadable modules in backtrace (with dependencies):
    com.apple.iokit.IOUSBMassStorageClass(1.4.5)@0x1ff4c000
    dependency: com.apple.iokit.IOUSBFamily(2.6.1)@0x515000
    dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(1.5.1)@0x677000
    dependency: com.apple.iokit.IOStorageFamily(1.5.1)@0x601000
    com.apple.iokit.IOSCSIArchitectureModelFamily(1.5.1)@0x677000
    Kernel version:
    Darwin Kernel Version 8.8.1: Mon Sep 25 19:42:00 PDT 2006; root:xnu-792.13.8.obj~1/RELEASE_I386

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