Thanks for posting. Apologies that your system is not performing as expected.
Have you run a systems diagnostics test? You can do this by pressing F12 at startup or using Support Assist http://bit.ly/1UXBb2H.
Run the diagnostics, make a note of any error messages, then post back here or contact Tech Support for further troubleshooting. You can contact Tech Support at 1-800-624-9896 or 1-800-288-4410, or you can
initiate a chat session http://dell.to/2v4snVm
Here is some information from the Dell knowledge base you may find helpful: