Please calm down, both of you. serkanozgur reported in his original post that he had already tried 3 different USB cables and 3 different computers - which is much more thorough than I expect from first-time users. Calvin pointed out that some USB cables are for charging only, and also pointed out issues with certain PCs that might be relevant. You have both written good posts, and there is no need to attack each other. At least one of you doesn't have English has his/her native language, and allowances should be made for that.
I will moderate any further posts in this thread that are not strictly technical in content (or are apologies).