Dual 867 MDD won't sleep after memory upgrade

Since yesterday my PowerMac G4 Dual 867 MDD has become insomniac. What changed since yesterday is that I installed an additional 512MB of RAM. So far as memory is concerned, there's the factory-installed 512 Infineon module; a second 512MB Kingston module (installed about a couple of years ago, and has been working fine ever since); and a third 512MB Kingston module (the one I installed yesterday) for a total of 1.5GB.
I am aware that sleeping issues can arise for all sorts of reasons (inc. USB peripherals) but it is pretty obvious that in my case the problem is caused by the memory upgrade.
The symptoms: Once I click Sleep on the Apple menu, I can hear the sound of the hard disks spinning down, but the rest of the box remains fully powered. The screen freezes and the computer has to be manually switched off, as the mouse cursor disappears from the screen and the keyboard becomes completely unresponsive.
So far I have tried the following: I have reset the PRAM (no luck there), and have tried switching memory modules to different sockets (basically, the single remaining free slot). I apologise in advance if that second troubleshooting routine might portray me as an ignoramus; I have a good understanding of things but cannot claim to be an expert.
I am a extremely frequent user of the sleep mode, and this issue has taken away from me all the pleasure that comes with a coveted (and long overdue) memory upgrade. I would deeply appreciate any help in resolving this.
Many thanks

Dear Dave,
Many thanks for your prompt response. I ran Rember (Amount of memory to test: "All". All other boxes unchecked - I was running other apps at the time). I cannot understand the results from the log, but I didn't get any feedback at the end of the testing. I attach the contents of the log below:
Memtest version 4.13 (32-bit)
Copyright (C) 2004 Charles Cazabon
Copyright (C) 2004, 2005 Tony Scaminaci (Macintosh port)
Licensed under the GNU General Public License version 2 only
MacOS X (Darwin) running in multiuser mode
POSIX version 200112
Pagesize is 4096
Requested memory: 18MB (19693568 bytes)
Available memory: 18MB (19693568 bytes)
Allocated memory: 18MB (19693568 bytes) at local address 0x02008000
Attempting memory lock... locked successfully
Creating test buffers...
Buffer A: 9MB (9846784 bytes) at local address 0x02008000
Buffer B: 9MB (9846784 bytes) at local address 0x0296c000
Running 1 test sequence...
Test sequence 1 of 1:
Stuck Address : ok
Random Value : \ ok
Compare XOR : ok
Compare SUB : ok
Compare MUL : ok
Compare DIV : ok
Compare OR : ok
Compare AND : ok
Sequential Increment: ok
Solid Bits : setting 1 of 64ok
Block Sequential : setting 1 of 256testing 224 of 256setting 225 of 256testing 225 of 256setting 226 of 256testing 226 of 256setting 227 of 256testing 227 of 256setting 228 of 256testing 228 of 256setting 229 of 256testing 229 of 256setting 230 of 256testing 230 of 256setting 231 of 256g 238 of 256setting 239 of 256testing 239 of 256setting 240 of 256testing 240 of 256setting 241 of 256testing 241 of 256setting 242 of 256testing 242 of 256setting 243 of 256testing 243 of 256setting 244 of 256testing 244 of 256setting 245 of 256testing 245 of 256setting 246 of 256testing 246 of 256setting 247 of 256testing 247 of 256setting 248 of 256testing 248 of 256setting 249 of 256testing 249 of 256setting 250 of 256ok
Checkerboard : setting 1 of 64ok
Bit Spread : ok
Bit Flip : setting 1 of 256ok
Walking Ones : setting 1 of 64ok
Walking Zeroes : setting 1 of 64All tests passed.
Thanks again,
Alex

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