Hi, I just got my new memory today. I already have 1gig so this is my second. It is the same TWINX model as my two other ones… but when I boot with them installed my two S-ATA hard drives cannot be detected. I took the two new sticks out about 3 times and reinserted them – booted up in between them with and with out them installed and my hard drives were back while they weren’t installed. When I boot it says I have 2048 memory in the check. Oh, and sometimes with the new memory installed it will detect my HD’s at first and get to the Windows XP log-on screen, restart after about 5 seconds and my HD’s are gone at boot yet again! - thank you for any help on this.