How can I "hard reset" my D-Link Router DIR636L ? It is impossible also to reset Admin password by the push button under the router. The router switch off by its own automatically!

SOURCE: Reset Password

please post the model name of the router

SOURCE: forgot passwrd on a us robotics router

Generally you have to push and hold the reset button, i suggest for 30 seconds, this should completely reset the unit, including passwords and settings.

SOURCE: Hard reset for 2 wire router 1020

If you do a hard reset on that sort of router, any information on the router will be lost, and the router will return to factory defaults.

Do you mean that you want to do a hard reset on your FRIEND'S router, so that you can go back to using the OTHER router that you lent him?

look for a small, recessed button on the back, near where the power cord plugs in.  you'll probably need a pen or sharp pencil in order to press it.

if you can find that recessed button, hold it down until the lights on your router blink 
simultanously, then release it.   I know that works on SOME models of 2Wire routers, I'm not certain whether or not this model has the option or not.
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SOURCE: forgot passwrd on a us robotics router

thankx log you are like goddd arrrrrrrrrrrr nice you have a nice future...............................

SOURCE: Is there any other way to reset the default

If you isp is Consoidated Communication

username admin
password cciadmin