Asus Zenbook UX303L boot to black screen, fans throttle for 4 seconds, then shut down

[supperhey]

Hi, it is my first post here so be gentle. I have an Asus Zenbook UX303L that was pushed back too far and broke the LCD back panel. The thing still works fine after the accident, and i tried to replace that part. Long story short, I replaced it and upon re-assembling it, the laptop boots to black screen, fans throttle for 4 seconds, then shuts down. The LED under the power button and the caplock are on within these 4 seconds. This is what i have tried:

-Disconnect battery, hold power button down for 60 seconds, then reconnect to the PSU and boot
-Remove CMOS battery for 1 minute, then put it back and try to boot
-Remove SSD, then try to boot without
-Remove RAM, then try to boot without
-Disconnect LCD cable, then try to boot with HDMI to external monitor
-Even in so far as removing the fan, apply thermal paste, then put fan back and boot

I am at wit end here. The laptop works before the repair process (with the broken LCD back). Right now whenever I connect it to the adapter, the light indicating the battery is charging or full lits up still. Please help me. Thank you in advance.

 

[Laptop_Nerd]

Hi,

You've pretty much done all the possible troubleshooting steps but here are some more steps that may help.
- Do try booting up your laptop without its battery and see if that will work or not.
- If these doesn't work do also try a different AC adapter that has the same voltage.
- If all these will not work it's the motherboard that is faulty already unfortunately.

 

[supperhey]

Hi,

You've pretty much done all the possible troubleshooting steps but here are some more steps that may help.
- Do try booting up your laptop without its battery and see if that will work or not.
- If these doesn't work do also try a different AC adapter that has the same voltage.
- If all these will not work it's the motherboard that is faulty already unfortunately.

Yes i've booted without the battery, does not work. And unfortunately I do not have another AC adapter since asus have their own adapter and the ones i have at hand does not fit. My Question is, how can the board fails that fast, it just sits in a spare laptop box, covered in bubble wraps for a couple days while i waits for the part, and upon re-assembling it just craps out? I always grounds myself to watch out for static shock and such also while working with these. Right now the thing is sitting at my house plugged in the wall bc i dont know what else to do beside getting a new CMOS battery (on its way). Im just curious whether it is possibly the cmos battery that does this (the ultra book is about 2 yrs old of use). The first trick i did usually works on non-powering mobo though, but this one still powers on, and just shuts off after the exact 4 seconds of fan-throttling.