I have purchased an additional 258 MB for my PC that has 128 MB RAM. There are two RAM slots. When I put in both memory cards, the system startup indicates 256 MB ram, but window hangs during startup without any messages. When I put either memory card in slot one, the system shows 128 MB RAM, and windows XP runs normally. My Bios String is: 07/24/2000-i810-W83627HF-6A69MC3DC-00 I believe this string indicates a ChainTech Mother Board, Model 6WSV2. On chaintech url, my mother board is visually similar to Model 60IA3T. Chaintech BIOS upgrades are at http://www.chaintechusa.com/tw/eng/Download/ Does anyone have any suggestions on how to identify the cause of XP hanging when both memory cards are installed. What additional information should I post?