I have an e-machines 420 desktop. Current memory is PC2700 512MB 184 pin 333 mhz. just bought and tried to install 1G ddr 333 pc2700 stick. label says AE25D1284 M40941 0814. The narrative at start up is: "ISSASS.exe - system error. The endpoint format is invalid." New board has 16 chips. Have i bought the wrong thing? Is this a Mac board? Is there a cure?