The problem could be with the hardware or software of the computer.
To identify the problem please follow the steps in the link: http://dell.to/NQbA8Z
If there are any errors displayed on the screen, please capture the error code and let me know for the next course of action.
Reply for further help.
Thanks & Regards,Nikhil D#iworkfordellTo know more about Dell Product Support, Drivers & Downloads, Order & Dispatch status -> choose your region US Customers; India Customers. For Dell Support videos click Here.