7559 - Laptop/Display failing to turn on following shutdown

(Specs at bottom)

A number of months ago, my Inspiron 7559 began to fail to turn on. Following a screen timeout, the keys would light up and the fans would run, but no display. Usually, a restart fixed. Throughout its lifetime (november 2015), this happened maybe once ever 3 months beforehand. As time went by it got worse, until about 4 months ago, it began to happen regularly, and not to turn on following a restart or shut down. Same story, fans and keys light up. IT would eventually start up after several, slow attempts however, now this weird sort of grey halo/fog appeared around the screen (pictured): Each time i did it, the fog got bigger (although it has 'reset' to smaller now since not turning it off).

https://i.imgur.com/XhCb0Qc.jpg

https://i.imgur.com/CPPJfgr.jpg

My temporary solution was - just dont turn it off or put it on standby, and this worked. As long as the PC (im thinkin display) is not turned off in anyway, it runs perfectly... infact, better than before. When it does turn off occasionally for updates (maybe 3 or 4 times), I go through the same troubles again, and need to restart it 5 or 6 times and after, the same routine happens: Launches startup repair - detects no issues. Fails to start. Try once more. Almost starts but stops. Try one more time: turns on.

I recently discovered it seems to turn on (better) when the battery is removed and it is plugged directly into AC. I also just plugged it now into a HDMI external monitor. The monitor is displaying fine, but now when I inplug the monitor, the screen on my laptop wont turn back on. Lastly, even if i tell the computer to "do nothing" when I close the lid, it still loses the display.

Moving or adjusting the screen in anyway however does not affect it. All components are up to date as far as I know, I have reinstalled installed display drivers, tried fiddling with many settings. I am aware my problem may be hardware but need to know if its worth fixing or is a more serious issue. Again keep note as long as it doesnt have to restart, the laptop works 100%.

Dell Inspiron 7559

Windows 10 Home

64-bit Intel Processor @ 2.60GHz

8.00GB RAM

Dell Inc. 0H0CC0 (U3E1)

Generic PnP Monitor (1920x1080@60Hz)

Intel HD Graphics 530 (Dell)

4095MB NVIDIA GeForce GTX 960M (Dell)

931GB Seagate ST1000LM014-1EJ164 (SATA) 42 °C

931GB Seagate BUP Slim BK SCSI Disk Device (USB (SATA)) 37 °C

Realtek Audio