1. 個USB3.0係WINDOWS裝咗driver, 但無法START－UP，可能死咗粒VIA USB3.0 chip
2. WIFI CARD is missing, but can be swapped back if you have a spare and the cables
3. yes, there is a pci-e slot and would fit a graphics card. The bottom hard drive cage is removable as well if you have a long graphics card!