Disconnect the main battery & cmos battery at the same time and leave disconnected for 2min or so. The cmos battery acts as a backup battery to the main battery I suspect so you have to disconnect both in order to clear the cmos settings.
Also check if there is no reset jumpers or buttons on the board.
Also try hitting the escape key rapidly while turning the power on. Also try the same with the f2 key.
The cmos might have a predetermined boot order set so maybe plug a usb stick in and see if it picks that up.
EDIT: I see a label in one of your picks indicating a reset button on what looks like the bottom of your laptop?
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