This Used computer is ready to use straight out of the box. It has gone through a thorough and rigorous Useding 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 Usedish 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 Usedisher in the United States.Product FeaturesManufacturer/Model: Dell Optiplex 990Processor: Intel i5 Quad Core Gen 2 3.20 GHzMemory Installed: 4GB DDR3Maximum Memory: 16GBMemory Slots: 4 SlotsHard Drive: 250GB Hard Disk Drive (HDD) SATAOptical Drive: DVD ROMVideo Card: Integrated/On-Board GraphicsMonitor: 19 *Please note: Used Monitors may have pressure mark(s) dead pixel(s) or minor scratches on casing but will not affect the prime viewing area. Our Used monitor brands may vary based on current available stock.Operating System: Genuine Windows 10 Professional 64bitNetworking / Communication: Network Card-10/100/1000 Wireless Networking-USB WiFi Bluetooth-Not InstalledVideo Input: VGA Port-1 Display Port-1 DVI Video Port-Not Installed HDMI Port-Not InstalledAdditional Ports: USB 2.0-10 USB 3.0-Not Installed Serial Port-1 Parallel Ports-1 Digital Card Reader-Not InstalledWeight: 13.01Dimensions: Height-11.800 Length-12.300 Width-3.700Product Color: BlackForm Factor: DesktopKeyboard: External USBMouse: External USBProduct Manual: We do not have manuals but they are downloadable from manufactures websiteAdditional Information: Item Condition: Grade A Used conditionPackage Contents: Dell Optiplex 990 Pre installed Windows 10 Professional 64bit power cord(s) keyboard & mouse and Blair quick start guideSku: PC-DELL-990-D-I5QC-32-4-250-DVD-10P-OBV-CR/19LCD/KEYBOARD/MOUSE