There were 2x 1GB chips in my 2007 mini. I bought 1x 2GB chip, because I read somewhere that model only would allow 3GB. After replacing a 1GB chip with the new 2GB chip, the system is only showing 1GB RAM installed. Is this what you’re talking about? If I buy another 2GB chip, will it work? PC2-5300 2 GB RAM Chip