I am currently unable to boot-up my Dell XPS 420 Desktop PC from a cold start. I have shut-down Windows and powered-off the Desktop PC completely and it will not boot-up again. All it does is get to a point, quite quickly, where it displays Diagnostic Lights 1, 2, and 3, and a blinking, white cursor at the top left of the screen, the rest being black. I cannot access the BIOS, as it doesn't reach that point and continued efforts to try turning it off and on again make no difference.
I turned the computer completely off for over 8 hours and now have tried to get it to boot up , so far with NO success??It has been waiting to boot up for over 3 hours.