USB trouble

[blackburn]

So lately my macbook "forgets" that has usb 2.0 and makes my ipod and my external hd work at snail 1.1 speeds. Happened in Snow Leopard and now in Lion.
I did a pram / smc reset and I've already clean installed Snow Leopard and Lion and the problem still persists.
Any ideas?

 

[Detrius]

Are you certain it's the USB that's the problem? Does it say in the System Profiler that it's connecting at the lower speeds? If so, it sounds like a bad logic board. Otherwise, a bad internal hard drive could cause the same "slow data transfer" symptoms.