Hello Tushar,
not sure if that helps in your situation, but the 2950 switch has a ´Mode´ button, if you hold that button for 10 seconds, the switch configuration is reset to factory defaults.
If that doesn´t help, you can try and boot the switch manually and then get to the initital system configuration dialog, follow the link below and execute steps 1 thru 5, skip steps 6 thru 7, and at step 9, type Y(es) at the rompt, this is where you get asked if you want to enter the initial config dialog.
CISCO CATALYST 2950 SERIES SWITCHES
Password Recovery Procedure for the Catalyst Layer 2 Fixed Configuration and 3550 Series Switches
http://www.cisco.com/en/US/products/hw/switches/ps628/products_password_recovery09186a0080094184.shtml
HTH,
GP
