Hi. Try to do a system restore. Please click on the link below for step by step instructions on how to do system restore for your Dell laptop.
http://support.dell.com/support/topics/global.aspx/support/kcs/document?docid=125982#Issue9
Try the next oldest restore point until the issue is resolved. Any software installed after the selected restore point needs to be reinstalled.
If system restore still doesn't work, run the "Pre-Boot System Assessment (PSA) Diagnostics and Error Codes For Dell Computers", you may click the link below to go directly to the support site, it contains instructions in running PSA Diagnostics and Error Code List with possible fixes.http://support.dell.com/support/topics/global.aspx/support/kcs/document?c=us&l=en&s=dhs&docid=266787#Issue2
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