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starting from rocker switch
Hi,
I have a strange problem concerning a PC I have just put together. First of it starts as soon as the power cable is connected and rocker switch is on, front power button has no effect. The fans start and you can hear the hard drive but there is no output to the monitor. One thing that concerns me is the motherboard is a Asus P5VDC-X with a 24 pin ATX power on the board yet the supply has 20 pin connector with a separate 4 pin 12v connector that I've put in the other motherboard connection. However this maybe of no consequence. Could this be an earthing problem? The power was cutting out until I tightened the fixings on the board. Thanks for an advise, Michael. |
#2
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starting from rocker switch
mike, you should prob. give component list, incl. OS with inquiry.
The 24-pin connector is used with MB's equipped for PCIe. If you ARE using a PCI Express graphics card which runs at over 40 watts, you'll need to replace the power supply with a higher current-capacity 24-pin job. see: http://www.planetamd64.com/lofiversi...php/t6052.html mike091 wrote: Hi, I have a strange problem concerning a PC I have just put together. First of it starts as soon as the power cable is connected and rocker switch is on, front power button has no effect. The fans start and you can hear the hard drive but there is no output to the monitor. One thing that concerns me is the motherboard is a Asus P5VDC-X with a 24 pin ATX power on the board yet the supply has 20 pin connector with a separate 4 pin 12v connector that I've put in the other motherboard connection. However this maybe of no consequence. Could this be an earthing problem? The power was cutting out until I tightened the fixings on the board. Thanks for an advise, Michael. |
#3
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starting from rocker switch
mike091 wrote:
Hi, I have a strange problem concerning a PC I have just put together. First of it starts as soon as the power cable is connected and rocker switch is on, front power button has no effect. The fans start and you can hear the hard drive but there is no output to the monitor. One thing that concerns me is the motherboard is a Asus P5VDC-X with a 24 pin ATX power on the board yet the supply has 20 pin connector with a separate 4 pin 12v connector that I've put in the other motherboard connection. However this maybe of no consequence. Could this be an earthing problem? The power was cutting out until I tightened the fixings on the board. Thanks for an advise, Michael. Starting immediately is not normal. I've experienced it here, when one of my IDE cables was only half installed. It could be that the stress caused by whatever connections were being made, caused the logic feeding the PS_ON# signal to be put in the ON state. So something could be pulling down one of the Southbridge local voltage rails, and causing the logic to malfunction. You could try placing the motherboard on a table. Connect the PSU to it. Connect a power button to the PANEL header. See if the bare motherboard is able to properly switch the PSU on and off that way. Running a 24 pin motherboard with a 20 pin power supply is OK. The issue, is whether the loading of the motherboard is too much for the 20 pin connector. If you had an SLI video configuration (two video cards), the answer would be yes, that would be too much current. But if you have just one video card, most video cards are designed to limit PCI Express slot current to about 4A or so. The single 12v wire on the 20 pin power connector is rated at 6A. So the 20 pin connector is sufficient if the only PCI Express card is a video card, and there are no other extraordinary loads. (Note that the motherboard fan headers also draw current from +12V, which is another 0.5A or so.) If testing the bare motherboard, still results in the power coming on before the button is pressed, and the motherboard is sitting on a nice insulating surface, then you should probably return the motherboard for warranty repair. Paul |
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