Wireless keyboard HP touchsmart 610

Hi,

I'm using a HP TouchSmart 610 and my wireless keyboard (original copy that comes along when I bought the desktop) suddenly stopped working.

I've researched for various solutions online and I found out that I'm suppose to have a wireless receiver. However, I can't seem to find it on my desktop. I'm quite sure I didn't pluck it out or anything of that sort, is it possible that the receiver is in-built?

Anyway I've tried the following:

1. Replacing the batteries
2. Taking the batteries out and putting it back in again
3. Hold the 'connect' button for 5-10 seconds

Those didn't work for me and I'm hoping that I could find a solution here.

Thanks in advance! :)

p.s hope I'm posting this in the right forum.