try swapping the chips around. may not be seated correctly or maybe dud chips. Try putting in 2, do they register 8GB. try the next 2, then the next 2. maybe you find 2 not working.
1.CHECK THE SPEAKERS.
2.CHECK THE SPEAKERS CABELS.
3.ON THE I/O-SHIELD THE LIGHTCREEN CONTACT IS
AUDIO OUT-PUT.
4.GO TO SERVICES AND RESTART WINDOWS AUDIO.