Pinebook no longer boots

[tophneal]

The laptop does not let me get that far to chose different boot options, it does not post - just a blank/black screen.

I get a green power indicator but nothing displays on the screen.

Is there any key press combination to load or boot up different options like hardware test, or a busybox like environment, or force a boot up to the SD card?

The Pinebook Pro does not utilize a BIOS/UEFI, but instead uboot, so usually there is no boot device selection screen (outside of using Towboot.) To boot an SD, download a live image from the wiki, use an app like Etcher, or dd, to write the image to the sd. After the image is written to the card, insert it into the PBP microSD slot, then boot the PBP. If the uboot isn't damaged, it should prioritize booting from the SD over the eMMC.