Cool, good to know your issue has been fixed!- Coolermaster PSU arrived, all is working fine now, thanks for all Your inputs guys !!!!
1. For the price, I would order both the A3 and the B3 to check them out. Plan B with the zip ties if needed.
2. I would keep the reset switch as a reset switch, find it useful sometimes when the computer freezes up or when it does not boot properly for some reason.
A dangling cable outside the case is a little meh, could be ok if not too long and hidden at the back maybe...
Depending on the cable provided by CougarGaming, I would cut their button and replace it with a button made for being attached to a hole in the back panel. Momentary or alternate button, depending on the one used on the CG box.
3.
@BaK : I followed your suggestion and got myself the buzzer you mentioned, but since all works, I won't use it now.
Since you have it I would install it. Hearing the single beep at boot is always reassuring about the health of your hardware.
External USB DAC is the way to go, you'll get much better sound than what your mobo can propose.I can only hear sound if I connect headphones at the moment. How do you guys do it for these tiny builds ? Do you connect something more sophisticated to those speaker pins or do you simply only connect your headphones or external amplifiers ?
An amplifier could be needed depending on your headphones or external speakers.
There are cheap to not so expensive USB DACs that work well if you are not too much of an audiophile, you will find plenty on ali. I'm very happy with the one I got for less than $100 and then attached to my active speakers.
For the headphones, you can have a look at www.head-fi.org or ask in their forum for best answers.