I purchased a used Razer Blade Pro (2017) from a local seller yesterday. I saw the laptop running, came home, and decided to change the SSD configuration to RAID, then reinstalled Windows 10, and updated the drivers. After many reboots, i saw the BIOS was on version 2.0, so went to upgrade the BIOS. It ran thru the update, and then powered down, and did not come back on. I waited a while, when nothing happened i turned it back on. Now the laptop turns on, the fans spin up, LED's are on, and the power button flashes green, but there's nothing on the screen. Then after around 90 seconds the pc turns itself off, and then back on and goes thru the same routine. I've plugged in an external screen which made no difference, i've unplugged the battery & cmos battery, but the laptop continues to have the same problem. Any ideas ?