HC-05 doesn't respond to AT commands even though it is in AT mode

felic:
I'm not sure if you're on drugs or something, but if anyone should be upset here, then it's certainly me. Why do I constantly have to repeat myself? Why did it took you until post #8 to realize that I' connecting to the HC-05 directly via a TTL cable?

Well, not only was that the first time you mentioned that you were attempting to configure an HC-05 with a PC but also I'm afraid it took me that long to realise that anybody might do anything so stupid. Further, not only were you never clear about what you were trying to do, but also you are deafeningly silent about the Arduino you are using, while some of the smaller ones use a TTL-USB adapter to connect to PC, and thus it would entirely appropriate equipment to configure an HC-05 with one of those Arduinos in the normal manner.

I apologise for for taking so long. If I had realised what a futile waste of time this was, I would never have attempted to help in the first place.