Question about Biostar : NF4ST-A9 Socket939/nForce4/DDR400/SATA/ATX Motherboard (MOTBI15)
PSU and case switch proven good with back-up mobo. Pressing case switch functioned only intermitantly until yesterday. VSB is 4.56VDC, PS_on reads 0.748VDC and does not go up when switch is disconnected. Shorting PS_on to ground turns fans on but does not post the CPU. Reset has no effect. I am wondering what could be wrong since I am leaning towards Motherboard due to a different issue where the onboard nic would drop connection all the time. Motherboard is less than a year old with no overclocking.
Power suplly problem
Posted on Sep 12, 2007
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Try to boot with 1 stick of ram then swap it with the other and try again. Next unplug the case front connections from the mobo header (pins). Draw a sketch where they all go so you don't forget. I'm talking about the power switch, reset SW, HDD LED etc. Also remove anything connected to the back panel printers etc. Also remove the mouse and keyboard. Carefully, momentarily short the pins that were connected to the power switch and note results.
If it still doesn't boot, remove all parts from the mobo except 1 Stick of RAM, graphics card, PSU, and of course CPU. Leave the mouse and keyboard unplugged. Try to boot by shorting the mobo pins again. If it doesn't boot it is most likely either the PSU or the mobo. It could also be the CPU or RAM but it is less likely.
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