Thanks Ivan,well..if that may be the main issue, i'll try to have it repaired,I will let you all kno...

i've tried to confreg the router with 0x2142 and 0x2102 address to reset the router running-config.....

@ ivan yes..it is 2801 routerbest regards,joe

thanks Peter for your response..yes, i'm sure it's the same CF card,.. i never change the IOS..here ...

i'm new to cisco router, recently i accidently remove the CF memory card from running cisco router, ...