hello all, It has been several weeks that I didn't transfer my files from my sd-card (8GB sandisk) to mbp, but today when I tried to plugged the sdcard to my mbp, it just didn't detect the sd-card. Then I tried 2 other sd-cards that I have and they are also cannot be detected. The mbp just didn't response at all (just like nothing is plugged to the sd-card reader). If I use usb external card reader, the sd-card can be read no problem at all.. does it mean that the built-in sd-card reader is broken? Anybody has experienced this problem?