PB 12" G4 supposed to have 512Mb RAM but only 384 ?

Hardware Overview:
Machine Name: PowerBook G4 12"
Machine Model: PowerBook6,8
CPU Type: PowerPC G4 (1.2)
Number Of CPUs: 1
CPU Speed: 1.5 GHz
L2 Cache (per CPU): 512 KB
Memory: 384 MB
Bus Speed: 167 MHz
Boot ROM Version: 4.9.0f0
Sudden Motion Sensor:
State: Enabled
Version: 1.0
Ok those are the specs of my machine
It was bought June 05 and came with 10.3.
I then installed 10.4 and have updated to 10.4.4.
In October I was editing a large DVD file and my mac became really slow. I thought it was bc my HD was too full (which it was). so then I bought an ext HD and transferred heaps of data over..
But it was still really slow, the same as before.
I am pretty sure it came with 512mb ram and is supposed to. I don't remember what it said when I first bought it but I'm pretty sure it would've been 512.
I have not tampered with or opened the RAM slot.
I bought the PB from a reputable apple reseller here in Sydney so I doubt they would've done anything dodgy. I called them and they confirmed it should've had 512. They also told me if there are major probs it will take up to 4 weeks to fix.
Since I can't live without my computer for 4 weeks (!!) I thought I could figure it out by myself.
Any ideas?
thanks.

Hi Livia,
I had the same problem with my PowerBook. Suddenly 128MB of RAM disappeared and the computer became slow. I was sure I had 512MB of RAM.
You should check in the System Profiler under Diagnostics if there is an error.
In my case, System Profiler reported an error with the user-replaceable RAM. I installed another RAM (1gb stick) the computer only recognized half the RAM from the chip and System Profiler was still reporting an error.
Now I must to take the powerbook to the technical service because the problem is in the logic board, not with the RAM.
Powerbook G4 12" 1.5 Mac OS X (10.4.4)
PowerBook G4 12" 1.5 Mac OS X (10.4.4)

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