T23 and 512 MB - DIMM - modules don't work with each other, getting only beeps

Hi there,
I searched the whole web, but nowhere getting the answer.
I'm having an Thinkpad T23 2647 with XP.
Actually it works without problems with 2 kind of 256 MB modules.
When I try to change it to one ore more 512MB modules, it comes the known beep-signal for dimm-failure (there is no combination possible, even standalone doesn't work).
I've the newest BIOS (1.20) and Embedded Controller (1.06a) installed.
The dimm-modules are 512 MB SDR PC133 with 144 pins bought via Ebay from CSL Computers in germany. 
I had the same problems a year before, but there I thougt it was the DIMM defect.
I need further help please.
Thanks and best wishes

It is possible that the T23 motherboard has a problem with some bad solder connections of the memory module sockets. I have personally have had at least two T23 systems with this problem (out of about 60 that have been in my hands - all purchased quite used from eBay). Your options are to change out the motherboard or to attempt to re-solder the sockets; not that easy to do but it can be possible with a steady eye and good hands (or is that the other way around ).
As a double-check, could you please list the TYPE number from the "System-unit serial number" in the main BIOS setup screen? It's only seven characters long and will start with 2647 or 2648. Don't list anything past the seventh character as that's the system's serial number and that's not needed here. I know that you've listed the 1.20 BIOS, which appears to be the latest for the T23, but I want to make sure that somebody hasn't put a T23 keyboard onto a T22 (or earlier) system. That would be one explanation as to why a 512MB module does not work and what fmyhr may have been thinking about earlier (systems older than the T23 will not work with "high density" modules).
Ray Kawakami
X22;X24;X31;X41;X41T;X60;X60s;X61s;X300;X301;Z60m;Z61t;Z61p;560Z;600E;600X;T21;T22;T23;T41;R50;A21p;A22p;A31 and A31p
Not a Lenovo employee; just a volunteer helping out here
All personal links to PC-Doctor software removed 8/2012 by mfg request

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