Try to see if you can get the beep code from Computer POST / beep codes.
I'm not sure if that is the whole beep code or if you cut in middle way. However, when trying to interpret it, consider the background continuous beep as the Long Beep and count the small ones.
I'm suspecting AMD BIOS and a bad video card or video memory. Probably caused by a short due to the accident. It's quite acceptable, in case you are wondering, that you can still get to see the POST screen. The card is still functioning obviously. But probably ruined. Anyway, this is my conjecture.
With your new information and after pondering a little more about it, I can tell you this is not a POST beep code. For one, the various Insyde's UEFI BIOS don't use beep codes anymore. It's all moved into event logs. And you do say you can get into the BIOS. Which means can't be POST beep. Hopefully this is just an essential hardware part that failed completely, like you video card (yes, it can fail and still display POST and BIOS screens), keyboard or motherboard.
You can try, just for fun to connect an external keyboard and see what happens. That should eliminate the keyboard option. Anything else, I suggest taking it to an Acer representative somewhere in your area. They will be the one better qualified to identify the damaged component(s) and replace them. You can even ask for a quote so that you make an informed decision based on costs. Just don't take it to generic computer repair shops.
All the best, good luck and I'm sorry I can't be more helpful.