Recertified can actually mean several different things from returned for a reason (including some dimwit that didn't know it had to be plugged in), retailers display model that was returned or overstock that's just reboxed and sold as "recertified". Usually have a shorter manufacturers warranty (90days)
 

qwertycopter

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From NewEgg's FAQ:

http://www.newegg.com/HelpInfo/FAQDetail.aspx?Module=5

What are Recertified products?

Products described as %u201CRecertified%u201D are products which have been retested to ensure compliance with original manufacturer specifications in function and for purposes related to warranty.

Recertified products typically:

-Have never been used, where the outside factory seal has been broken. This can be due to a cancelled order for example.

-Are items returned to the original manufacturers that were used in field tests, sales displays or demonstrations.

-Products that have been returned for warranty service, which have been brought to manufacturer specifications.

-Are products that have been returned for reasons other then defect. These items are sent to the manufacturer for inspection and testing. The passing products are then repackaged as recertified.

-Are items where the box was damaged in shipment and is then returned to the manufacturer.

-May include a limited manufacturer warranty %u2013 see items product page on the website for details

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That's slightly better than open box:

What is a open box item? Does Newegg.com open box items or does the original manufacturer?

Open Box items have been opened and touched and/or returned. Because they originate from different situations, they may or may not include accessories, documentation or retail packaging. Refurbishment is done by the manufacturer. Open Box products are warranted for only 15 days. We recommend that you try out your open box product immediately after receiving it.