My Onda 1800 just arrived from China. Just a motherboard in a bag, no box, no documentation, nothing else with it at all. Is that how they are normally shipped?
That's how mine came... very cavalier, the Chinese.
Me and the OP might be experiencing the same problem - using 1.5V DDR3 memory instead of 1.35V DDR3
L. In my case, I ordered what was described as DDR3/DDR3L memory from Amazon, as 1.35V is compatible with both, but they shipped 1.5V modules; a replacement module came in today and I'll be trying it out momentarily.
EDIT - well, "correct" DDR3L memory didn't solve the problem entirely, though it does seem that the board makes it farther along the boot process. I get one beep and then even a bit of HDD LED activity but no video from either of the 2 cards. I haven't tried the onboard VGA port for the simple reason I don't have a monitor with a VGA input; haven't in about 15+ years, actually... I guess the next step is to scrounge up a VGA input LCD monitor because it seems like that is the only issue.
I also tried hitting the "reset CMOS" button (just to the left of the USB/Ethernet ports) and that just resulted in a longer beep after power cycled.