Hadn't used my laptop in about a week and when I turned it on, the keyboard lit up, Dell splash screen came on and the windows (10) icon showed up...then it just went dark. Pushing the power button again, the keyboard lit up and immediately shut down. I thought perhaps the battery was discharged, so plugged in the AC adaptor.....and although the adapter's blue light was glowing, the laptop's front-edge power-indicator light did NOT come on. The same problem reoccurred when attempting to start up. I have tried the various test methods mentioned on this site (including those done with the battery removed), to no avail. Again, Pushing the power-button causes it to light up and the keyboard to flash momentarily....and nothing else.
Any suggestions?