Hi Ive bought a Kingston KTA-PB533/1G memory stick for my new 17 inch 1.67 - after looking at some pages in the buying tips section. And it freezes my computer after about 20 to 30 minutes of useage. I tried to remove the old (512 mb) chip but it still freezes. Even tho the ram test (both the long one and the short one) says that all the ram is ok. Is this caused by bad RAM - or is it just that kingston ram doesnt work on the new powerbooks ? Here is the link for the ram stick: http://www.ec.kingston.com/ecom/configurator/partsinfo.asp?ktcpartno=KTA-PB533/1G Any suggestions ?