Hard Reset Router

The alternative (and one I prefer with BT routers) is to lightly fry it in a deep-fat fryer for 4-5 minutes and then go out and buy a proper router ;-)

Check out that there is a small hole (pin size) at back side (where wires are plugged in). Insert some pin in that for few seconds to reset.

@AnilKumarSharma - please read the entire thread before posting.  I have already advised to reset the device using the reset button.  Your comment does not add anything that has not already been covered.

@alanhardisty: I have read the thread properly but looks you have not understood the problem of the user. Better to leave the option for the author who is able to judge that which one s/he clear to him. My answer is refined form of your answer (what is back of router or bottom of router???, what is the size of hole??? May be he try it in power plug hole? ). I just help the user to locate that hole by giving its size location etc.
If your my answer is helpful for user then there is no use of your comment whether it addes anything or not.

@AnilKumarSharma - Please look at the link showing the router which clearly has a hole marked reset.  It won't take a genius to work out where it is:
http://www.auctiva.com/hostedimages/showimage.aspx?gid=726050&image=280269235&images=280269205,280269235,280269275&formats=0,0,0&format=0 

@alanhardisty: Good that atleast author and others will be helped further by our discussion. BTW, you may call it not a genius, but this is the problem I also faced and get the answer as you given. But I still not able to locate (for your information there are so many dacorative holes that I almost skipped this small hole). And also but not last not every one has this new labelled routers. I have one that was installed by some service company and no labelling was there and of course i was not smart then to look into internet to first find the my router type and then search the picture for same. Some local vender when come and shown the hole then suddenly the voice come OMG...what the hell no one tell me how small the hole is and its position. Anyway dont take it personally I just want to help the user when I saw the same reply that I faced and still not found the answer and need to call a local engineer to reset the same.  I hope you now better understand the things.

@AnilKumarSharma - No problems - I just felt that you were repeating what I had already said.  Yes the router is holier than the Pope but I had not understood that some were not labelled.  Typical of BT - which is why I personally never use them, hence my deep-fat-fryer comment :-)
They are great for basic internet stuff, but if you want to restrict outbound SMTP to specific internal IP Addresses, you are not going to be able to.

Thank You. It worked.