I just purchased a used Mac mini on ebay to replace my aging 10 year old iMac. I purchased a mid 2010 Mac mini with 2.4 GHz processor, 4 GB ram and 320 GB hard drive. The Mac has a 30 day return guarantee. I'd like to know how to confirm all is well with this Mac. Of course I'll confirm all ports. I'll run disk utility to see if the hard drive is okay. What else should I do?