since only Alienware has secure os boot and let me point out windows is about the only os you can install on a alienware since you cant install linux trust me i tried on my alpha the only thing that did work was steamos i suggest if you can boot into safe mode on your ssd especially if you have windows installed properly here's what i suggest you want to click repair windows on the ssd drive and whichever drive has the original target operating system you want to delete it and format then try to boot on ssd if that does not work i suggest looking into the cause if its a external problem you may need that part of the laptop replaced also more than likely its just the target system not allowing you to boot another copy of windows on your computer so hope this helps 

Hi @haiminh,

SSD brand and model?

Check boot priority after installing it.

Reinstall Windows with both installed to see if that helps. Make sure AHCI is set in BIOS, not RAID.

actually, before i open the laptop to clean and fix temperature, the laptop use normally with 2 ssd.

but after i reinstall laptop, this problem begin appear, so sad. 

i tried to reset window but this problem can not fix.

i don't know what happen!? 

Reply with a picture of the boot tab in the BIOS. 

this picture, right!? 

please help me!