PC No longer recognize 256 MB memory
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.