I'm having the exact same issue!!!
I just got my ASUS Xonar STX today, I've been troubleshooting through the vast interwebs to find a solution. In detail, here's how attempting to install the software goes: Run software. Reminds to plug in molex power cable(Check). Go into install screen. Agree with terms. Software gives me the following message: "Please plug in ASUS Xonar Essence STX audio device!" With the options of "Retry" or "Cancel".
Here is one "solution" I found might work for others, but I don't think it's the case for me. Rather then go much in detail, I'll just give a link, basically a confliction of software/hardware:
http://vip.asus.com/forum/view.aspx?board_id=21&model=Xonar+Essence+STX&id=20110312101917644&page=1&SLanguage=en-us
...For me, however, the "ACS-6xxx" doesn't exist in device manager, with or without hidden items enabled. Although, I did look up the latest drivers for USB 3.0 on my motherboard and downloaded them just in case(still didn't show up afterwards? Or fix the issue). *NOTE* that in device manager, it DOES pick up my sound card as a "unknown multimedia device". In other words, I think I DID install it correctly? At the very least, my PCI-E slots must be fine(I think I've had video card{s} in every different slot by now).
I have tried multiple slots now on my ASUS Crosshair Formula IV, both with the same result. I've disabled my on-board Sound card of course. I checked my drivers, everything appears to be up-to-date.
There is even an alternative Unified Xonar software made by third-party, which while seemed to half-work, it wasn't actually giving play-back. In other words, I still need my original drivers installed.
I will say this much to the post of tinmann; I'll fiddle with the molex power connection a bit. Maybe there is a sweet-spot, and this is the stupidest series of issues I've ever dealt with ever.
I just got my ASUS Xonar STX today, I've been troubleshooting through the vast interwebs to find a solution. In detail, here's how attempting to install the software goes: Run software. Reminds to plug in molex power cable(Check). Go into install screen. Agree with terms. Software gives me the following message: "Please plug in ASUS Xonar Essence STX audio device!" With the options of "Retry" or "Cancel".
Here is one "solution" I found might work for others, but I don't think it's the case for me. Rather then go much in detail, I'll just give a link, basically a confliction of software/hardware:
http://vip.asus.com/forum/view.aspx?board_id=21&model=Xonar+Essence+STX&id=20110312101917644&page=1&SLanguage=en-us
...For me, however, the "ACS-6xxx" doesn't exist in device manager, with or without hidden items enabled. Although, I did look up the latest drivers for USB 3.0 on my motherboard and downloaded them just in case(still didn't show up afterwards? Or fix the issue). *NOTE* that in device manager, it DOES pick up my sound card as a "unknown multimedia device". In other words, I think I DID install it correctly? At the very least, my PCI-E slots must be fine(I think I've had video card{s} in every different slot by now).
I have tried multiple slots now on my ASUS Crosshair Formula IV, both with the same result. I've disabled my on-board Sound card of course. I checked my drivers, everything appears to be up-to-date.
There is even an alternative Unified Xonar software made by third-party, which while seemed to half-work, it wasn't actually giving play-back. In other words, I still need my original drivers installed.
I will say this much to the post of tinmann; I'll fiddle with the molex power connection a bit. Maybe there is a sweet-spot, and this is the stupidest series of issues I've ever dealt with ever.
Sorry for the long post, but, information is power right? I'll post my results with tinkering on power/molex cord, if anything significant changes.