This issue is now solved. Transpired it was a Windows issue
I have a Dell Inspiron 14 5490 laptop, it's 17 months old. As of this morning I have a black screen on start up which I cannot fix. I have googled and tried many of the suggested remedies. Reboots, holding down the power key for a minute, I even removed the battery and tried rebooting. I have tried restarting holding down the D key, I got the multiple coloured screens in rotation as expected then back to black screen. Anyone got any more ideas beyond taking it in for repair? Thanks for your help
Black screen Dell Inspiron 14 5490