Hello pedro702. I guess you were right with the USB port being damaged. I first tried to start from scratch and restored my Nand, then reinstalled all needed IOS, but without success. Then I switched to my "emergency" Wii and did exactly the same, but so far the games have run flawlessly (spent more than an hour on Starfox Assault, when I couldn't play more than 15 minutes before). I put the "Drive Access LED" on, and can indeed notice that the HD is being accessed more than with the old Wii, so probably the USB port was being defective. Thank for your help and patience, I guess little sister is gonna take place of my old Wii lady from now ! ... 8 years was a good score, but no near from my old Super Nes, which was still working when I sold it, 19 years after ! Anyway, thanks to you, as well as to Fix94 and GreyWolf. Have a nice day !