Norm Why wrote:
You can get a "no beep" condition, by using a
reset button crushed in the ON position. Usually
OEM computer cases are the ones with sufficiently
cheesy buttons on the front of the computer, to
make incidents like this possible. I have one
computer here, where the buttons are such,
I know that some day that's how those buttons
will fail. The buttons speak of cheapness.
Anything mechanical is always suspect. I've been using a couple of
identical Antec cases, not normally noted for being cheap, for computers
now residing in the basement "computer room". Not too long after
purchase (but outside any hope of warranty) the power switch failed on
one of them and drove me crazy for a while. Rather than give up I
swapped the connections between "power" and "reset" on the MB and it has
worked fine for years now. Only real problem is that I can almost never
remember which of the cases has the swapped switches. If I had any sense
I'd apply some masking tape over the dead switch to remind me...
Thanks John. Maybe reassignment of connections is the answer.

Because of propagation delays, the group seems not to have seen my latest
post or

"How-to-connect-case-cables-system-panel."
https://assets.rockpapershotgun.com/...stem-panel.jpg
What is that a picture of ?

It doesn't seem to be your GA-EP45-DS3L.

And the black wiring depicted, is a mistake when
doing builder work. You want classically colored
twisted pairs for each 2-pin thing needing
connections. It makes it easier to get the polarity
right on the first try (for LEDs).

No harm will come from hooking up a two pin pair the
wrong way around. I prefer the color code, because
it tells me "what they had in mind" when they wired it.

Antec in particular, has made mistakes on front panel
wiring more than once. The part I consider weird
about this, is when they do make a mistake, it's *never*
with the VCC pin, never a risk of smoke or fire.
How do they make these mistakes, without ever
involving a "hot" pin ? I could never figure that
part out. If you bring me an Antec case today,
I'll get out my ohmmeter and buzz out the wiring
harness, before using it.

Paul

It is not a picture of my GA-EP45-DS3L. It is other unnamed MOBO. It is a
picture my MX330-X front panel connections. It shows speaker(beep)
connections to pins 18, 14 on unknown MOBO. It would make a beep. But it
still does not solve my problem. I am preparing a customer care support
email to Cougar.

The usual miserable documentation. It says on the page
that they're Compucase, and this is a subbrand of theirs.

https://cougargaming.com/products/cases2/mx330/

https://cougargaming.com/fileadmin/d...usermanual.pdf

Doesn't have wiring harness info in there that I can see.

It's quite common, to not document the wiring actually.

*******

https://cougargaming.com/global/img/...s/mx330/06.png

2x5 - dual USB2 cable, hopefully shielded, industry standard pinout?
2x10 - dual USB3 cable, industry standard pinout?
2x5 - HDAudio for headphone and microphone jacks

HDD_LED, PWR_LED, PWR_SW, RST_SW, SPKRpair (five 1x2 or similar)
(may have labels on box-pins)

It's not clear from the photos, whether there is a SPKR.

I looked at the pictures of the case and cannot see any sign of it.

*******

USB2 cable - usually not a problem, follows industry standard with one keying
pin missing to help with keying it correctly. 9 working pins.
USB3 cable - usually not a problem, follows industry standard.
One keying pin missing, 19 working pins for two 9 pin interfaces
HDAudio - Can be a dogs breakfast of seemingly random wiring
and what might look like a jumper wire of some sort.
- computer cases with jack-sensing side contacts are
proper HDAudio setups. They use AC97 audio wiring
when they don't have the side contacts.

Front Panel - the pins are likely labeled
- if SPKR is a 1x4 and has lift-able tabs, you can
move the pins in the shell if the motherboard uses
a 1x2 header pair for SPKR.

HTH,
Paul