I purchased this unit to replace an existing Dell computer that had become incompatible with almost everything due to Windows VISTA as its operating system. I was hesitant about purchasing a refurbished system but a need to save money and positive reviews convinced me to buy. This unit arrived with the serial number blacked out, no paperwork of any kind including a receipt or invoice and in an unmarked box. Despite this, the initial set up seemed okay. 3 months later the screen displayed a blank blue screen with an error message while resuming activity from an idle state. Efforts to address the issue including restarting, rebooting and completely shutting down the system yielded no positive results as the unit maintained that it had shut down incorrectly. The remaining option given was to reinstall the operating system. Although personal files were maintained as Windows 10 reinstalled, all imported software was lost and it took several days to get the system fully operational again. Less than 2 months later as I sat watching a YouTube video the screen went black, system shut down and unit powered off. All efforts to power it back on failed. The extended warranty I had purchased through Square Trade would not accept a claim because it was under a year and supposedly under warranty with the manufacturer. Dell's warranty had been invalidated because it was a refurbished system. Since the purchase was through a third party merchant, Amazon could only refer me to them. It was beyond 30 days after purchase so Blair Technologies refused to give me a refund but maintained that I could ship the unit to them at my expense and their technicians would try to get it running. Then ship it back, again at my expense. So after spending a lot of money in shipping costs, I end up with a doubly refurbished unit that I don't trust to begin with. I gave up, accepted the loss and purchased a brand new computer from Dell directly yesterday.