RE: XPS 15 screen becomes white
Thank you for your response, in order to initiate the diagnostics you will have to shut the computer down and then keep pressing and holding the FN key and then power on the computer which will initiate the diagnostics on the computer and you will see the Pre- Boot System Assessment. As the test will run automatically, once the test is completed it will display an error if any or else all the tests will pass.
Please also install the BIOS, Video and Chipset drivers mentioned on the previous post.
Let us know if this helps.