PC Build Help
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-Elmer-
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- Nov 6, 2012
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Could you give some more details about the build? What kind of motherboard, memory and CPU are you using? Any add-on cards? And what kind op PSU? And what exactly happens why you hit the power button? Do the fans start? Does the speed of the fans drop during the first few seconds? Does it give any beeps (do you have connected the internal speaker?!?)?
-Elmer-
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- Nov 6, 2012
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What do you mean by hit the power on the PSU? Do you mean to turn on the main switch on the power supply? When you turn on that switch, normally nothing happens (expect for a couple of LEDs on the mainboard that turn on). The PC shouldn't turn on.
It it interesting that the front LEDs turn on, usually that only happens when the PSU has received a 'start' signal from the motherboard and you should hear all the fans/hard disk etc. spinning.
Have you connected all the front buttons and led according to the manual? It is often quite easy to mix up the polarity. Also try to reset the BIOS of the motherboard, either by the BIOS-reset jumper or by removing the backup-battery while have the PSU disconnected from the grid.
I haven't been able to find the onboard speaker on the FM2A75 Pro4-M motherboard. Does you case have one? If so, please connect it. Also, try booting you PC with only the processor and memory connected to the motherboard. If it does but with such a minimal set of components you know there's something wrong with the other hardware. If it still doesn't work, try to boot without the memory. If your CPU, PSU and motherboard are working correctly, you should here several beeps.
It it interesting that the front LEDs turn on, usually that only happens when the PSU has received a 'start' signal from the motherboard and you should hear all the fans/hard disk etc. spinning.
Have you connected all the front buttons and led according to the manual? It is often quite easy to mix up the polarity. Also try to reset the BIOS of the motherboard, either by the BIOS-reset jumper or by removing the backup-battery while have the PSU disconnected from the grid.
I haven't been able to find the onboard speaker on the FM2A75 Pro4-M motherboard. Does you case have one? If so, please connect it. Also, try booting you PC with only the processor and memory connected to the motherboard. If it does but with such a minimal set of components you know there's something wrong with the other hardware. If it still doesn't work, try to boot without the memory. If your CPU, PSU and motherboard are working correctly, you should here several beeps.
fudungi
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- Jul 24, 2013
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if you look through your motherboard's schematics, there should be a switch labeled clear_cmos, that should reset the bios. However, just turning the psu switch from o to i should not normally turn on any lights, that's what the front power button is for. Consider checking your wiring, you may have accidentally switched something or forgotten a slot
-Elmer-
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- Nov 6, 2012
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It actually sounds if you accidentally connected one of the front LEDs to the motherboard connectors of the power switch. The very small voltage might cause the LED to blink (though not very likely) however, it is more likely that it acts as a permanent pressed power switch. I've seen it before and although it appears that the PC is turned off, it actually turns on and off multiple times per second.
Disconnect all front panel connectors and make 100% sure that the wires for the power buttons are connected to the PWRBTN and the GRND pins on the 'System Panel Header'. Connect PSU to outlook, turn the PSU switch on and look for any blinking front LEDs (there shouldn't be any). Then hit the front panel power button.
If this still doesn't work, disconnect the power button cable from the 'System Panel Header', turn on PSU and carefully shortcut the PWRBTN PIN and the GRND pin (which is right to the PWRBTN pin) with a conductive screwdriver top (better not to touch other components/pins). When the systems turns on, immediately break the shortcut. By doing so, you manually imitate the function of the power button. Last week I've actually seen a systemcase (Antec 300) with a defective power button, although it was the first time in my live I've seen it, it can happen.
Here you can find the manual of your motherboard:
ftp://europe.asrock.com/manual/FM2A75%20Pro4-M.pdf
On the bottom of page 40 you can find the information regarding the 'System Panel Header'
Disconnect all front panel connectors and make 100% sure that the wires for the power buttons are connected to the PWRBTN and the GRND pins on the 'System Panel Header'. Connect PSU to outlook, turn the PSU switch on and look for any blinking front LEDs (there shouldn't be any). Then hit the front panel power button.
If this still doesn't work, disconnect the power button cable from the 'System Panel Header', turn on PSU and carefully shortcut the PWRBTN PIN and the GRND pin (which is right to the PWRBTN pin) with a conductive screwdriver top (better not to touch other components/pins). When the systems turns on, immediately break the shortcut. By doing so, you manually imitate the function of the power button. Last week I've actually seen a systemcase (Antec 300) with a defective power button, although it was the first time in my live I've seen it, it can happen.
Here you can find the manual of your motherboard:
ftp://europe.asrock.com/manual/FM2A75%20Pro4-M.pdf
On the bottom of page 40 you can find the information regarding the 'System Panel Header'
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