Look BC, I gave you some incomplete examples.So, the POST freezing is not in link with the USB problems.Both are things which happened independently.In all, my computer is not working normally( for example, sometimes when I'm making a image with, let's say, Alcohol, suddenly a blue screen appears...Yes, of course, you can say that this can be a drivers problem but I can assure you that all the software is all right and very well checked on my PC.These are some issues from a lot of weird problems that are happening in my PC.The only explanation( believe me, I've worked a lot) can be a beta version of BIOS.