Hi guys and gals. I have an older Acer Aspire 3100 laptop that runs Windows XP 32 bit, Sempron 3200+ processor.. Originally, it only had 512 RAM installed in one of the two bays. I went ahead and bought two 2g ram cards to upgrade. However, after installing both and trying to power on, the DVD drive won't stop cycling and it never even gets to the Acer screen. However, if I substitute the 512 card back in for either of the 2g RAM cards, it works just fine. I have tested both 2g RAM cards and they both work fine in combination with the 512 card. I even switched slots to determine if that was a problem. It wasn't. What's going on? I thought if I installed 4g, the 32bit system would see 3g and still operate okay. That is not the case. What setting changes do I need to make if any? Anyone ever had this issue? Thanks