I recently encountered a booting Issue with my blade 15 and it looks like this (not my video), I heard it could be the CMOS battery being dead or whatnot but after reading the comments it appears that even after replacing the CMOS battery it still happens. I also bought a new CMOS battery similar to the one in the laptop (ML1220) but it has a different Connector so Im hoping you guys can also help me source the right one.
TLDR:
Blade 15 having boot issues like this could be a dead CMOS battery but also something else.