1.Restart your computer.
2.When the Dell logo appears, press F12 key on the keyboard several times to open the One-time Boot menu.
3.Use the down arrow key on the keyboard to select Diagnostics and press the Enter key.
4.Follow the on-screen prompts and answer them appropriately to complete the assessment.
5.Write down any error codes listed
6.Use the Dell Interactive Support Agent(English only) to get information about ePSA or PSA diagnostic error codes.
If you have a serious computer error, this will get very hard.