Question Dell Latitude D430 stuck keys after keyboard removed

Jun 22, 2020
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My Latitude D430 pops up Windows shutdown menu which makes the PC unusable. I initially thought keys Ctrl + Alt + Del and Esc are stuck so I took out the keyboard, it keeps on popping up. I tried reloading Windows 7 with external keyboard but I couldn't finish cos the keys interrupts the operation.

I loaded a USB mini XP OS on it and discovered that the problem starts when the laptop runs for about 5 minutes or thereabouts.

P.S. I have stripped it down to only motherboard and it does the same thing. Any idea on what to do?