Over the years I've accumulated various dead Mac Minis that either won't get past the initial boot screen or won't power on at all. I can't just ditch them because they contain a mix of business and personal data, but I can't wipe the data either because I can't access it. Assuming I don't want to spend hundreds of dollars enlisting professional aid from a data extraction service, what can/should I do with these things other than continuing to store them in my home until the end of time?