Hi [NAME] thank you for sharing update.  The Alienware 17 R5 has a hardware problem and has automatically started to use ePSA Diagnostics to undertake memory test. ePSA Pre Boot System Assessment Dell Overview (Official Dell Tech Support) - YouTube  Hopefully POST is now giving diagnostic lights within the on-button, or maybe diagnostic beeps. When splash screen appears, press and hold down the F12 key, then select Diagnostics followed by pressing Enter key. Stop ePSA memory test and click on icon in bottom RH side of screen to enter test results and individual test menu. The ePSA test summary pages should reveal root cause of problems with hardware.  It seems that POST is unable to detect RAM cards. Please clean with dry lint free cloth to remove dust from card and its slot, and then reseat one RAM card and then the other RAM to see if laptop stops doing a memory test.  The OS(C:) boot drive connection may also have a bad connection from dust and should be cleaned and reseated.   Please share an update on progress, so that other users derive benefit from your experience. Thank you. 
I have recently replaced the battery on my 17 R5 as it was swollen. Once changed, I plugged the cord in and the Alienware logo lit up to show it was charging. I was unable to power on the laptop however. After some time I checked over everything and now the logo is not lighting up. I have two power supply's and have checked with both, however both seem to have the same result. Can anyone help? Is there something I'm missing? Or has the motherboard become damaged by the battery?
17 R5, replaced battery, dead