Hi I have just installed the new ASUS A8N-SLI Premium Motherboard and its not turning on, the power supply is not on, green light shows on motherboard . I am not using a atx power supply. Do you have to use the atx. What else could be the problem. All connections are connected. I am using a Titan III Power Supply.
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Here is the manual for your motherboard (since describing a diagram probably isn't very useful...) http://dlcdnet.asus.com/pub/ASUS/mb/socket939/A8N-SLI/e2024_a8n-sli.pdf
You want to look at pages 27-35, they describe what you need to plug into the motherboard. Basically make sure you have connected:
1) 24-pin power cable (from power supply) 2) 4-pin power cable (for CPU from power supply) 3) Any case fans with 3/4 pin connectors. 3) hard drives (SATA or IDE) 4) USB front panel ports 5) Audio front panel ports 6) Case plugs (power LED, hdd LED, power switch, and reset switch).
If you do turn off USB 2.0, you may have two options, "Full Speed" and "HiSpeed". Make sure you use "Full Speed", as it's faster than "HiSpeed".
But the real answer is that you need to install the USB driver for your motherboard. If it came with a CD, insert the CD and read the instructions on installing drivers from it; otherwise, check Asus's website under the Support/Downloads section.
Sounds like the power supply is overloaded. Is this a new configuration? Start removing components until it powers up. If it still doesn't power up, check to ensure you don't have a short in any of the connectors that you installed components into. Sometimes when a video card, memory DIMM, or whatever, gets installed, there is a chance that a connector pin will get crushed and short out to nearby pins. If none of those work, you might want to try a larger wattage power supply. Good luck.