Securely disposing of old IT equipment

If we want to dispose of a server, how can we ensure that any areas that may contain passwords or sensitive data (BIOS, etc) are sanitized/purged without physically shredding all electronic components? It’d be environmentally unfriendly to shred an entire motherboard, which would reduce its recyclability. I think some vendors my publish instructions but others may not, particularly for older equipment. Is there any reliable resource, even a paid one, that gathers this info? I understand that with some classifications …

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