Lenovo ThinkCentre Computer M91p Desktop 4GB RAM 500GB HDD Windows 10 Home – Black (Black). This refurbished computer is ready to use straight out of the box. It has gone through a thorough and rigorous refurbishing process as well as Quality Control Testing. First, we erased all of the previously stored data according to DOD standards. Then, we replaced any failing or bad hardware including the hard drive, memory and capacitors. We have verified that all of the ports and connectors are in proper working order. SAVE TIME with the freshly installed digital product key for Windows 10 operating system. No more keying in 25 tiny, hard to see, characters or loading time to activate. It will automatically activate once the license agreement is accepted with the click of a mouse! We are one of the few who are actually MICROSOFT AUTHORIZED to refurbish these machines. Many of the others are just Microsoft REGISTERED. These sellers aren’t able to offer the same level of quality. Buy with confidence from the #1 Microsoft Authorized Refurbisher in the United States. Product Features Manufacturer/Model: Lenovo ThinkCentre M91p Processor: Intel i5 Quad Core 2.50 GHz Memory Installed: 4GB DDR3 Maximum Memory: 8GB Memory Slots: 2 Slots Hard Drive: 500GB SATA Optical Drive: DVD ROM Video Card: Integrated/On-Board Graphics Monitor: Not Installed *Please note: Refurbished Monitors may have pressure mark(s), dead pixel(s), or minor scratches on casing but will not affect the prime viewing area. Our refurbished monitor brands may vary based on current available stock. Operating System: Genuine Windows 10 Home 64 Bit Networking / Communication: Network Card-Not Installed, Wireless Networking-USB WiFi, Bluetooth-Not Installed Video Input: VGA Port-1, Display Port-Not Installed, DVI Video Port-Not Installed, HDMI Port-Not Installed Additional Ports: USB 2.0-2, USB 3.0-Not Installed, Serial Port-Not Installed, Parallel Ports-Not Installed, Digital Card Reader-Not Installed Weight: 16.53 Dimensions: Height-3.900 Length-13.270 Width-14.500 Product Color: Black Form Factor: Desktop Keyboard: External USB Mouse: External USB Product Manual: We do not have manuals but they are downloadable from manufactures website Additional Information: Item Condition: Grade A refurbished condition Package Contents: Lenovo ThinkCentre M91p , Pre installed Windows 10 Home 64 Bit, power cord(s), keyboard & mouse, and Blair quick start guide Sku: PC-IBM-M91p-U-I5QC-25-4-500-DVD-10H-OBV-CR/KEYBOARD/MOUSE/WIFI While we aim to supply accurate product information, it is sourced by manufacturers, suppliers and marketplace sellers, and has not been provided by Overstock.