Problem with Unit G

Hello,
I have a trouble with my laptop Satellite L300, because when i insert a memory photos card (MMC) in the pannel in front, it`s read in correct way the card, after i put eject security funtion and the sistem disconnect the device, the is because when i need to use again this port i insert the card but the sistem do not reconize the port.

Ah i forget it, When i start my computer always appear like the MMC Card port is busy (like have a card inside and there arent any device inside)

Please help me to resolve this trouble please.