I've been having this occasional problem since updating to 4.3. Every now and then, when I boot the Wii, after the warning message, it'll give the system is corrupt message. Sometimes, this'll happen many times in a row before finally booting into the system menu. I've tried reinstalling sm4.3 as well as the corresponding ios. It seems like unplugging the usb hard drive helps, but that's probably just coincidental. Anyone have any ideas? sm/ios written to failing part of nand? It's definitely a rare issue. The last time I had it was a few months back, and it's been fine up until a day or two ago. Since then, it's happened maybe 10 times though.