Hi Prakash,
My name is Puneet and I am an engineer from small business support center.The SG94 switch is an unmanageable switch therefore there is only a chance of replacement without any technical troubleshooting on the device. Its just like a plug and play switch.
In case the switch is not powering on, Please contact the SBSC team to get a case opened for the replacement. To get a case opened with Cisco SBSC please either raise a chat or call on the number given in the link below:
Call: http://www.cisco.com/c/en/us/support/web/tsd-cisco-small-business-support-center-contacts.html
Chat: https://supportforums.cisco.com/community/4841/online-chat-support
Regards,
Puneet Sandel
Cisco SBSC
