X1 Carbon (3443CTO) start up blank screen and no activities after BIOS ACHI to Compatibil​ity

Hi everyone,
I have a X1 Carbon 3443CTO and it's running fine.
Last night everything was ok and I went into the BIOS and changed AHCI to compatibility (don't ask me why, I was doing some testing), then I went "Exit and Save Changes" (at the last page of BIOS). As soon as I press Enter the screen freezed there (as opposed to reboot)
Since it hangs there I hold the power button and it shutdown.
Then I power it up again, but now, here is the problem:
1) The computer turns ON, keyboard backlight flash on for a second (normal)
2) Screen stays blank (no, it's not the backlight faulty)
3) power light turns ON (normal)
4) no sign of activities pressing any buttons, no beep sound
I am not sure what the problem is but it feels it's due to BIOS setting I did that caused the problem. Would someone please help me to resolve this (urgent)?
Many thanks!!!
John
Solved!
Go to Solution.

It turns out that the board does need replacement, they are ordering the part and getting it replaced.

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