PC won't power up via the power on switch. Switch is OK and so is the power supply as I am able to simulate power up by grounding the power on input to the power supply (green wire going to power supply). Motherboard is an RC410M Rev 1.03
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Re: PC Power up Problem
Hi im josh in cebu phils. friend i suggest to check the two cables from power supply the 16pins and the 4pins 12volts.be sure you mounted it firmly to avoid this connection and to provde you with enough power to make the mainboard work. good luck.
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Remove the switch mode power supply from the computer. You need the pin out details of the 20 pin connector from this WEB site. http://pinouts.ru/Power/atxpower_pinout.shtml. You will also need a multimeter to test the 4 pin connectors for the 5 and 12 volts. Connect a hard drive to one of the 4 pin power connectors, this will provide a load on the power supply when it is powered up. Connect the mains power to the switch mode power supply and if the switch mode has a switch on the back then switch it to the ON position. Straighten a paper clip to form a U shape and insert one end of the paper clip into pin14 and the other end into pin 15 or 16 or 17 (ground). This is the same connection/switch on the power button on the front panel of your computer. You can now measure the voltage on the 4 pin connectors for 5 volts (red and black wire) and 12 volts (yellow and black wire). If you don't get these voltages then the switch mode power supply is faulty and needs to be replaced.
here is a pic look at the right top right side there is a 4 pin power plug and make sure that you have the cpu fan wires to the cpu plugin it says cpufan on board ok http://www.asus.com/Motherboards/P5PEVM/
This is really poor practice and an excellent way to destroy a motherboard.
You should always have the board connectors plugged in before turning on the power supply, otherwise you may be blowing ICs left and right.
It's perfectly OK to plug the supply into the wall or turn on its power switch with the board connectors in place.
Also, nearly all modern boards have a set of pins that go to the front panel 'power' switch which does not switch AC but sends a logic signal to the power supply to turn the rest of the voltages on.
Those pins have a 5V potential on them that is typically grounded to tell the supply to turn on.
If you're lucky, you still have an undamaged motherboard.
Check ALL your USB ports..
If any of the USB ports have shorted contacts or if the 5v rails are shorted to ground, the power supply WILL NOT switch on.. Also, if any of the items connected to the board have a supply rail grounded, again the board will not allow boot up. Unplug everything from the board and the drive power connectors too, except the power connector to the board and the front panel switches and try to switch on, if it still will not boot, check and recheck the USB ports and all power connectors, if it does, switch off and plug another item in, then switch on again. When you get to the item which prevents the board from switching on, thats where your problem lies. Dont forget, plug things back in one at a time, including the power plugs to the drives and try and power up between each item, and dont forget to power down after each item has been checked..
assuming that u r a professional.. hv u tested the 3.3v..the ram..the cmos battery (above +3v)..the cpu.. if so look for the smd fuse..capacitors (esp above 1000mfd)..mosfets..circuitry at the south bridge..the crystal clock generator.. hope this'll work..else contact system admin/vendor....
Looking at the front of PC remove the left side panel. Now looking in at the board. There are two rows of pins in the lowest right hand corner of the board. Your PWRSW is your power switch. Its a two pin connector. The ground wire will be black or white. The ground faces to the right & connects at pin 4 counting from right to left. Power switch takes up pin 4&5.
All done. If tech switched the wires by mistake than flip the connector 180*.