Is it possible to connect A20-OLinuXino-MICRO to VGA monitor?
Yes it should be, there is one connector on the board for this.
You can look at user manual
https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-MICRO-4GB/resources/A20-OLinuXino-Micro.pdf
Can you post the user manual updated to Rev D board?
I've got no sata power connector next to the sata data connector.
On there there are only two hole for external 5 volt power output.
I've got the sata power connector next to the dc input connector.
I don't know if there are other difference.