Unfortunately These type of cards won't help unless they sell for significantly cheaper. :(
Miners like to sell off their ex-mining cards to gamers when they are done with them to help offset the...

It does that on mine too if I expand/collapse the action center, I just reboot and it returns to normal.

Test other system sounds in Control Panel / Hardware & Sound / Change system sounds and "test" to see if any of the other system sounds are working for you.

If none of your other system sounds are...

It has worked for me with every Windows 10 Pro insider build so far.
I'm currently using build 10166 and it still works....no login for me. ;)