Kernel Panics - bad RAM?

Question

Recently, I will come back after leaving my MacBook unattended for an hour or so and find the "You must restart" crash screen. Upon restarting, the crash report would show a kernel panic. More recently, a variety applications will randomly crash, and their error logs will all say "KERNINVALIDADDRESS".
I figured this was a RAM issue, so I ran the full AHT, and it returned the following error code:
4MEM/4/40000000
However, this was with a mouse, keyboard, and external LCD connected, so I ran it twice again without the peripherals. Both times, it passed with no errors. Would a USB mouse, keyboard, and a DVI monitor really screw up my RAM somehow? I don't understand what the problem could be. I am currently running without any of them attached, and so far so good...
I'm running 2GB of Corsair RAM I installed myself. It has been running since June without any problems at all. I have been using these peripherals almost continuously since August without any trouble with them either.
Any ideas? Thanks!

Answer 1

I think my keyboard is causing the trouble; it crashed again about an hour after reconnecting it.
What information in the crash report could help pinpoint the problem?
panic(cpu 0 caller 0x001A3135): Unresolved kernel trap (CPU 0, Type 14=page fault), registers:
CR0: 0x8001003b, CR2: 0x0aac5488, CR3: 0x00daa000, CR4: 0x000006e0
EAX: 0x0392a680, EBX: 0x0397f000, ECX: 0x00000050, EDX: 0x038cd700
CR2: 0x0aac5488, EBP: 0x00108f38, ESI: 0x00000000, EDI: 0x03979900
EFL: 0x00010046, EIP: 0x003ad279, CS: 0x00000008, DS: 0x00100010
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x108d68 : 0x128d1f (0x3c9540 0x108d8c 0x131df4 0x0)
0x108da8 : 0x1a3135 (0x3cf1f4 0x0 0xe 0x3cea24)
0x108eb8 : 0x19a8d4 (0x108ec8 0x0 0xe 0xffd0048)
0x108f38 : 0x6d14fb (0x3979900 0x0 0x3979900 0x0)
0x108f68 : 0x6307c5 (0x38cd700 0x0 0x38c8580 0x50)
0x108f88 : 0x629c1f (0x3876600 0x0 0x38c8580 0x50)
0x108fa8 : 0x3b9d21 (0x38c8180 0x0 0x38c8100 0x50)
0x108fe8 : 0x19aa20 (0x25203e78 0x25203e78 0x19ba76 0xb1f000)
0x25203f18 : 0x1a42f5 (0x1f 0x1 0x25203f38 0x6)
0x25203f38 : 0x19d871 (0x0 0x0 0x0 0x206)
0x25203f58 : 0x135f23 (0x0 0x0 0x0 0x0)
0x25203fc8 : 0x19a74c (0x0 0xffffffff 0x8 0x45f51a8) Backtrace terminated-invalid frame pointer 0x0
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AppleAPIC(1.2.0)@0x6d0000
com.apple.driver.AppleACPIPlatform(1.0.5)@0x628000
dependency: com.apple.iokit.IOPCIFamily(2.1)@0x57f000
dependency: com.apple.iokit.IOACPIFamily(1.2.0)@0x624000
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
Model: MacBook1,1, BootROM MB11.0061.B03, 2 processors, Intel Core Duo, 2 GHz, 2 GB
Graphics: Intel GMA 950, GMA 950, Built-In, spdisplaysintegratedvram
Memory Module: BANK 0/DIMM0, 1 GB, DDR2 SDRAM, 667 MHz
Memory Module: BANK 1/DIMM1, 1 GB, DDR2 SDRAM, 667 MHz
AirPort: spairportwireless_card_type_airportextreme (0x168C, 0x86), 0.1.30
Bluetooth: Version 1.7.9f12, 2 service, 0 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Network Service: Parallels Host-Guest, Ethernet, en2
Network Service: Parallels NAT, Ethernet, en3
Serial ATA Device: TOSHIBA MK8032GSX, 74.53 GB
Parallel ATA Device: MATSHITADVD-R UJ-857
USB Device: Built-in iSight, Micron, Up to 480 Mb/sec, 500 mA
USB Device: Hub, Up to 480 Mb/sec, 500 mA
USB Device: Natural® Ergonomic Keyboard 4000, Microsoft, Up to 1.5 Mb/sec, 500 mA
USB Device: Microsoft IntelliMouse® Explorer, Microsoft, Up to 1.5 Mb/sec, 500 mA
USB Device: IR Receiver, Apple Computer, Inc., Up to 12 Mb/sec, 500 mA
USB Device: Apple Internal Keyboard / Trackpad, Apple Computer, Up to 12 Mb/sec, 500 mA
USB Device: Bluetooth HCI, Up to 12 Mb/sec, 500 mA