Cisco 2600 router problem

Hello
i am new to networking ,
i am doing testing on cisco router2600 series 2620,

this router had not enough memory so i installed 32 MB and it already
had 16mb , so now it has around 48mb of ram,

The router worked fine few days and was talking commands and i
configured IP address and also can connect through telnet.
but now suddenly it stopped and can not take key inputs from keyboard
it boots up fine and asks for setup initial configuration [y/n]:
and i can not enter anything

Any help appriciated
Thanks
Pinto