Hi Masamune12003,
Changing the USB cable is usually the easiest and quickest solution. But it seems that doesn't solve the problem for you.
If you plug in your SD card, does it recognise the memory and show up in Windows? If it recognises the SD card memory while plugged into your player, then that tells me its a fault with the internal memory. However, if you are still getting "USB Device Malfunctioned" message with the external SD card plugged in, then most likely it's the USB pins on your player that's faulty.
Has your player ever been detected by Windows before?
Also, what operating system do you have? If it's Windows 98 or ME then you have to install drivers for it as well btw.
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