I recently bought an 8gb SDHC card in order to watch videos and such on my Wii, but it's not working. The Wii recognises I've inserted the card, but just says 'this card is not usable'. I've tried formatting it dozens of times, and it's definitely not locked. I've blown the SD slot free of dust and there's no obvious damage inside.
I've read a lot of similar threads on here, but most are outdated (they say SDHC cards aren't compatible, neither are 8gb cards of any sort, but the Nintendo site says they are supported now) or are different issues.
My Wii is too old to be able to sent back for repairs and the Nintendo site returns an error message when I try to ask them about it.