I just built a computer using the foxconn digitalife a76a-s motherboard, and am having issues with the USB ports and the video out. My USB mouse isn't getting any power and my monitor is receiving no input from the video card. Everything else seems to be working fine; the fans, the graphics card fan, the LEDs, etc.
Can you help?
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One of two possibilities; the Motherboard or power supply. In my case it was the Motherboard. Those cheap capacitors tend to go bad over time without being used. I purchased a replacement motherboard(Foxconn RS 780 "bengal") from a place in WI. Skyline on Ebay. I would do a search on Ebay for Gateway Foxconn Bengal RS780 Motherboard. Then get the number and call. You can use the old processor, ram, and maybe the graphics card, but I'd run the onboard graphics first(if you do happen to have replaced the motherboard) to make sure the graphics card isn't causing an issue. You will need to do some research and reading on the net about installing new motherboards and hardware. If the motherboard is the same, Windows should still work with it. Do your homework first as this is only a suggestion as to your problem. It is what happened to my Gateway DX4300-03. Check all power supply related, graphics card and wire connections first before you consider the motherboard thing.
I don't know how old your system might be or how many USB controllers it has on the motherboard, but understand this...
Theoretically, one USB port can support up to 999 "daisy chained" devices.
With that said...the way a USB port is implemented on a motherboard,
manufacturers enable two or four ports to be working off of one USB
interface. Those ports you see on the front of your computer are most
likely connected to just one USB interface on the actual motherboard
and that's why you always see computers with USB ports located together
With that in mind, you're USB ports are connected to what is referred
to as a "hub"(that motherboard interface), which only outputs so much
power. If one device or many devices attached to this "hub" exceed the
power output of this "hub" then it will either back down to USB 1.1
speeds or it won't function at all. That is why some USB accessories
require their own wall adapter, because the USB can't supply all the
necessary power for it.
So one of two things has happened, either your USB port is fried or you introduced a new USB item to the "hub"
that surpasses the power requirements of what your USB hub can output
once you plug in your mp3 player.
You can troubleshoot by unplugging all un-necessary USB
equipment and try only that port again. My assumption is that the USB hub is fine but
the actual usb port you use might be damaged.
maybe the problem isn't in the sound cards or buil-in sound cards, i'm sure it's the speaker your are using, it may have some power leakage or something of that sort...
check your electric "ground" connection too.