The only descision I have to make now is if I hate &^%#ing computers or I &^%#ing hate computers. Grrrr!.
I’ve been doing fine with a Via P4X266A motherboard for about three months. When I came back from a weekend away it wouldn’t wake from standby. Bottom line is no USB devices work. A closer check showed no +5v at any of the USB connections. All the power supply voltages are good though. Get the motherboard replaced but it was an open box return. It works fine in the evening. Next morning I get ready to connect all the front panel LEDs and whatnot and close the case… no USB. This time I have low voltage at all the ports, about 3.6v but sags to about 2.9v if I plug in the USB keyboard or mouse. I may see it the data from the USB works with a powered hub but I’m sure Fry’s will accuse me of abusing the motherboard if I take this one back. Any thoughts.
Is it the same model of motherboard? It may just be a problematic model. Or, your powersupply may be defective. I’d think that would cause more problems than just the USB. Are you sure that the motherboard is properly isolated, not touching the case metal at any point? If it was shorting out at roughly the same point, it may cause this problem.
Same model of motherboard. The only place it’s touching the case are at the ground/mounting points and the RF shield where all the i/o headers are. I’ve unplugged everything else including the video board to see if something else was causing the problem. Seems realy fishy that the motherboard would regulate or have an effect on the +5v for USB when there are two regulated 5v lines coming from the power supply. Been looking to see if this is a known problem in the board but even Tom’s Harware doesn’t have any reviews.
The motherboard has control over the powering of all devices not directly connected to the power supply. Just to make sure, you do have BOTH power connectors hooked up to the motherboard, right? Both the large ATX connector and the smaller ATX+12V connector?
Yes, both are connected. The voltages at the PS look but I have to buy a replacement power supply to fix another machine anyway so I’ll give that a try.