Looks like no post.  Cpu fan does not spin.  Battery removed.  Laptop on Dell charger.

memory and charger tested working in another unit of same model.

can laptop get stuck in Post?  Does not show any video, no Dell logo.

can laptop cmos settings get cleared?  Not experienced w laptop cmos battery removal technique.  Any other way to reset E7270 cmos and give another try?

btw laptop w no video still gives correct 2,3 amber, white blink or 2,4 blink when no memory to wrong/bad memory installed respectively, suggesting some basic post logic test still works.