Cannot reset my Dell desktop to its factory settings

How to Find the Dell Part Number for a GX270 Replacement MotherboardIf the motherboard of your Dell OptiPlex GX270 desktop computer starts to malfunction, find the replacement part number online by obtaining the Dell service tag located on the back of your equipment. The service tag is made up of five to seven alphanumeric digits and is specific to your desktop computer.<br /><br /> <span>Instructions</span><br /> <ol> <li>Unplug your GX270 desktop computer and turn the device around to the back.</li> <li>Locate a white bar-coded label affixed to the side of your desktop computer. The service tag for your computer is imprinted on this label.</li> <li>Visit the Dell upgrade and replacement parts web page and enter the service tag for your computer into the "Service Tag Search" field. Click "Search."</li> <li>Navigate to the "Compatible Parts" Section and click the category "System Drives." Type "Motherboard" into the search field, then click the "Search" icon.</li> <li>Click the link for the GX270 motherboard. Scroll to the section "Component Part Number" to locate the GX270 motherboard part number.</li></ol><br /> <span>Other Tips</span> <ul> <li>Also find the part number for your GX270 motherboard within the "Replacement Parts" section of your owners manual.</li></ul><br /> <span><span>References</span></span> <ul> <li><a href="http://www.dell.com/downloads/us/products/optix/gx270_spec.pdf">Dell: Dell OptiPlex GX270 Overview</a></li> <li><a href="http://support.dell.com/support/DPP/Index.aspx?c=us&l=en&s=gen">Dell: Product Support for OptiPlex GX270</a></li> <li><a href="http://support.dell.com/support/topics/global.aspx/support/en/identifyyoursystem?c=us&cs=19&l=en&s=dhs&%7Elt=popup&%7Emode=popup">Dell: Find Your Service Tag</a><br /></li></ul><br /> <span><span>Resources</span></span> <ul> <li><a href="http://accessories.us.dell.com/sna/DellPartsFamily.aspx?c=us&l=en&s=dhs&%7Eck=anav&category_id=7566&ST=dell%20replacement%20parts&dgc=ST&cid=17745&lid=774124&acd=sqx784iXu,5531454746,901pdb6671">Dell: Replacement Parts Web Page</a></li></ul>*please leave a ratings if this information is helpful and beneficial to you.<br /><br /><br />Regards<br />MultilinkEnt.