How to test electronics without power adapter.?

Is there anyway to test electronics when you don't have a power adapter. I buy used stuff at goodwill and they usually don't have a power adapter. I need something to test that product before i sell it on Ebay. I need something that will test old SLR cameras, Xbox 360, etc. Can you do it with a Multimeter.... show more Is there anyway to test electronics when you don't have a power adapter. I buy used stuff at goodwill and they usually don't have a power adapter. I need something to test that product before i sell it on Ebay. I need something that will test old SLR cameras, Xbox 360, etc. Can you do it with a Multimeter. I bought a PSU to test car cd players, Power amps and speakers. I find really expensive electronics at goodwill for really cheap and most of them don't come with a power adapter and i need something that will test them if they work or not.
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