Rakuten states for this item:
"This Dell All-in-One set is ready for use right out of the box. It has been refurbished by a Microsoft Registered Refurbisher. It contains a large 500GB hard drive, 2GB of RAM, an Intel Pentium 4 processor, a DVD-RW drive, and Windows XP Professional Operating System. This unit comes complete with an all-in-one 17 monitor, keyboard and mouse. Power adapter and power cords are also included. We offer a 1-year warranty for parts and labor only. Shipping charges are covered for any replacement unit or item within the first 45 days. After 45 days, customer is responsible for any return shipping charges."
The best thing to do would be to call Rakuten support and ask for a replacement computer since the one you have is not working. If it has been less then 45 days then they should be paying for the return shipping costs.