Has my RAM died?? help

I have 1.25 GB RAM installed but my mac only sees 768...256 from the logic board and 512 installed but the chip is a 1 gig chip and I've had it for quite some time...what happened? apparently my mac had a kernel panic last nite late am, and I get a crash report this morning and noticed that activity monitor only showed 768...the crash report is below...can anyone make sense of it? has my memory died? what's up?
panic(cpu 0 caller 0x000A8D80): Uncorrectable machine check: pc = 00000000000A4528, msr = 0000000000149030, dsisr = 40000000, dar = 0000000043FAC93F
AsyncSrc = 0000000000000000, CoreFIR = 0000000000000000
L2FIR = 0000000000000000, BusFir = 0000000000000000
Latest stack backtrace for cpu 0:
Backtrace:
0x00095718 0x00095C30 0x0002683C 0x000A8D80 0x000A8010 0x000ABD00
Proceeding back via exception chain:
Exception state (sv=0x32E5E000)
PC=0x000A4528; MSR=0x00149030; DAR=0x43FAC93F; DSISR=0x40000000; LR=0x000E8398; R1=0x1CE8BB20; XCP=0x00000008 (0x200 - Machine check)
Backtrace:
0x43FAC93F 0x0022216C 0x00221DDC 0x002306BC 0x000E4870 0x002307E8
0x000F92F0 0x000EC7AC 0x000E8F74 0x000EC7F8 0x002AA2E4 0x000ABEB0 0x795A2C8A
Exception state (sv=0x335E2500)
PC=0x9003B0CC; MSR=0x0200F030; DAR=0xE0006000; DSISR=0x42000000; LR=0x00002FE0; R1=0xBFFFFD80; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 8.5.0: Sun Jan 22 10:38:46 PST 2006; root:xnu-792.6.61.obj~1/RELEASE_PPCModel: PowerBook6,8, BootROM 4.9.0f0, 1 processors, PowerPC G4 (1.2), 1.5 GHz, 768 MB
Graphics: GeForce FX Go5200, GeForce FX Go5200, AGP, 64 MB
Memory Module: DIMM0/BUILT-IN, 256 MB, built-in, built-in
Memory Module: DIMM1/J31, 512 MB, DDR SDRAM, PC3200U-30330
AirPort: AirPort Extreme, 404.2 (3.90.34.0.p16)
Modem: Jump, , V.92, Version 1.0,
Bluetooth: Version 1.7.0f18, 2 service, 0 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Parallel ATA Device: MATSHITADVD-R UJ-835E,
Parallel ATA Device: FUJITSU MHT2080AH, 74.53 GB
USB Device: Bluetooth HCI, , Up to 12 Mb/sec, 500 mA
USB Device: Apple Internal Trackpad, Apple Computer, Up to 12 Mb/sec, 500 mA

Try removing and reseating the SODIMM into the socket. Push firmly so that it's seated all the way. If you have the Apple Hardware Test CD, you could also try running that while you have the SODIMM removed, to see if the problem is the socket itself.

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