what device , what model ?
do u have any output at all ? what is your console settings in Putty? What are settings of router console port (u can change those). Boot a device into a ROMMON/Switch mode and check settings; If there is IP set up on device, u can try telnet to it. Check device documentation on how to boot to ROMMON/Switch mode (password recovery doc usually have step by step)
Regards, ML
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