PC No longer recognize 256 MB memory

11peach

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I was running (PC3200 DDR) 512 MB memory (Crucial) on a amd-2700 (win 2K) fine for about a year.
6 months ago I added another 256MB (PQI) and worked again fine. I often checked it was running at 768 MB.
Yesterday, I pulled 256 MB PQI stick and replaced with Ultra 512 MB. Computer won't start. I remembered that when I installed Crucial it says that not compatible with certain type of module (? * 64) So I thought that must be the problem. I pulled off Ultra and put back PQI. It started fine and work again.
I was replacing monitor today and happens to look at system info and found that it only shows 512 MB memory. I used contl-alt-del and checked again, 256 MB is not being recognized.
Anyone has any idea what is the problem and how to fix it? Thanks in advance.

peach
 
Maybe because you handled it to roughly. RAM modules are built to be handled with care.
 
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