Regarding wifi extender N300 model no: WN3000RP

Hi all ,I recently purchased the WiFi range extender and for my Netgear router Netgear D1500 n300.my extender was initially able to detect the signal of my router however, after a power cut, the extender was not able to pick up my routers signal I tried to resetting the extender and going through the setup again..however on the setup page my extender detects every other WiFi router in my apartment but mine..i tried connecting it via WPS as well but no luck whatsoever. My WiFi router works perfectly and all my other devices can detect it and can connect to it with no issues. Is this a problem with my router or my extender? Thanks in advance