If two AC adapters are showing unknown, the DC power jack is the likely issue. The system will not flash a BIOS (nor should you) with an unrecognized AC adapter.  
I got this computer about a year ago and barely used it.  Recently noticed that it kept power off whenever I move it a bit.  It turns out that the battery is not recognized.  I tried to follow some tips here and managed to have the battery shows up, but it will not charge.  Following more tips to find out that the AC adaptor is shown as not installed in the BIOS.  I even tried to download the BIOS update but still cannot install due to battery at 0. While I was looking into the issue and opened up the back of the laptop, I noticed that a cable seems to be loose.  Some google later I can identify it is the power cable of the I/O-board.  There is a latch that should be able to secure the cable in place, but this one does not lock in place(I have confirmed that another cable does lock in place).  Could it be the reason for my problem? Also noticed that in Device Manger there is an "System Firmware 1.19.0 that has a warning mark.  I assume that is the BIOS update that can not install due to no battery?   Please help!  What I should do?  should I go buy a new I/O-board, and will that solve all my problem?  Thanks
could the I/O-board power cable connection problem cause "AC adaptor not 
installed"