Question about Intel MOTHER BD S3420GPLC 0GHZ NO CPU - S3420GPLC S3420GPLC Motherboard

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When I switch to turn on the power supply the motherboard work for a second and reset

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Check for the Mains voltage that the system is getting ... this happens in Low voltage. A malfunction in SMPS could be a reason!
If U have enough knowledge of removing and installing RAM, then, Remove Power cable and clean the brass tooth of the RAM with fresh white paper, and put it at its place again. Poor conductivity conductivity is a possible reason. please Do not try anything else...

Posted on Sep 28, 2010


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My Compaq Presario SR5140NX will not turn on. No lights at all. Is there a way to test the power supply using a multitester? Roy

could be a lot of factors that would cause it to not power on. try to isolate them one at a time starting from the very obvious. often we may overlook something just because it seems too easy and obvious. i would suggest checking the power cord making sure it is securely attach to the power supply of your computer and to a verified working power outlet. if by any chance you are using a surge protector or UPS, try to disconnect them temporarily and directly plug the power cord to a working wall outlet. if you have an extra power cord, try testing it. a faulty cord will cut the power flow from the outlet to your unit. next, remove all attached devices including mouse and keyboard to the tower/unit to make sure none of the external devices is causing a possible short to the system. another thing to try as you said is to test your power supply. unplug the computer from the wall outlet, press the power button for about 10 to 15 seconds just to drain any residual power. Then disconnect all cables/connectors of the power supply from the mainboard/motherboard and other internal devices you have. This is to isolate it from the rest of the computer. You can then use your short the pin 15/16 from the 20/24 pin connector using a paper clip or a piece of wire to allow you to see if the power supply fan will spin which will tell if it is at least working or generating power. from there, you can use a multi-meter to test it. Instead of laying down all the steps, it may help checking some guides online on how to perform a tester. you may check this one as it has some images that may help you go through the process.
if you have isolated that your power supply is faulty, you will need to get a replacement. if you have confirmed it works, next thing to try is to minimize the internal devices on the computer and reset the cmos jumper. check the manual for your computer for the reset jumper settings/pins. be sure to remove the cmos battery then set the jumper settings, and plug the 12 volts or 20/24 pin connector from the power supply back to the motherboard. plug the power supply to an outlet and see if the motherboard will have any light, will generate any beep or if the fans will spin. if so, allow it for a few seconds, then turn off the power supply switch or unplug it if it has no switch. adjust the reset jumper back, put the cmos battery back then try to switch the power supply again. if it fails to power on, most likely a replacement motherboard is needed. on the other hand, if it powers up, then try to connect internal devices back to the motherboard and power supply testing the power each time to see if any of the components is actually shorting out the unit until you identify what may need to be replaced. if you get lucky, resetting the cmos jumper alone may fix the system without the need to replace anything. hope this helps. good day

Feb 20, 2015 | Compaq Computers & Internet

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The LED in my motherboard is on, but if i turn on the switch, their is no response. the power connection is correct. but it doesn't work

Try swapping the power button connection with the reset button connection. Then to turn on your computer you will need to press the reset button. If that works you have a faulty power button. Otherwise try using a different PSU. One that you know works. If that doesn't help the motherboard will have to be replaced.

Jun 18, 2011 | ASUS P5VD2-VM SE - Motherboard - micro ATX...

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I just finished building a PC using motherboard Biostar N68S, but it won't power up. When I push the power button, it only works for 1 second. Everything is connected. What seems to be the problem?

Try to verify these :
1- Check that all perepherals are connected correctly (HDD, Drives...)
2- Check taht the motherboard support the CPU you are using.
2- Check that the RAM is correctly inserted (use an other connection slot)
3- Check that the CPU is correctly inseted and that the FAN is correctly placed
4- Check all USB port, may be there is a short circuit.
5- Check your AC Power.

Good Luck.

Apr 01, 2011 | Biostar N68S NVIDIA MCP68S Socket AM2+/AM2...

1 Answer

I too have a similar problem. The LED on the motherboard is on when power is applied. I think I've isolated it to the front chassis power and reset switch combination. The reset switch crumbled when I...

Both the reset and power switches are normally-open, momentary contact to operate. If you twist the reset leads together, it's the same as permanently holding the motherboard reset button pressed. You don't need the reset button in any case, so you don't have to worry about replacing the switch.

The LED on the motherboard indicates the presence of standby voltage, so the power supply is working to at least that degree. The power switch is only a signal to the motherboard to turn on the power supply and start the rest of the system operating. So if the system doesn't come on when you press the power switch, either the power supply is bad or something is preventing the motherboard from starting properly.

A quick test of the power supply is to ground the PS_ON pin in the output connector:


Unplug the connector from the motherboard and use a piece of wire or a bent paperclip to short the pin marked PS_ON to the ground pin on either side in the same row (not across to the other row, which is the standby 5-volt pin!). If the power supply is working, it will turn on and its fan will start running. This doesn't mean the supply is 100% good, but if it doesn't start with this test you certainly need to replace it.

If the supply starts this way but not when it's connected to the motherboard and you press the power switch, then you'll need to figure out why the motherboard's not starting. There may be something wrong with the board itself, or something connected to it is preventing it from starting. Removing parts and parts substitution will help you find the culprit.

As far as getting a replacement switch assembly, you might try Gateway support to find the assembly part number and see if they offer it for sale, or check eBay. Or you can try replacing the switch by itself. On some assemblies the switch is just held into the bracket by tabs, and companies like Digi-Key and MCM sell suitable replacements.

Jan 18, 2011 | Gateway 510 X (10272197) PC Desktop

1 Answer

My AMD computer started rebooting on its own minutes into a boot. I tried reinstalling a fresh copy of XP but it would reboot into the installation. It reboots in the BIOS setup so it is not the O/S. It...

this is a mobo setting try reseting the board using the bios jumper switch it to the reset possition turn on pc /switch off pc and replace to original setting see if this helps b4 replacing board

Jan 01, 2010 | Computers & Internet

1 Answer

I tried several different cards but no luck. Cards work ok on other computers.

5V Stand-By Indicator LED
The power supply will always supply a 5V standby voltage to your
motherboard so that it can power on via for example Wake On Lan
technology. This LED shows that your power supply is supplying
this standby voltage to your motherboard.n :D

You may need to replace your power supply, if the LED is flashing, it's not supplying the power the motherboard needs.


1 2 3 4 5 6 7 8 9
. . . . . . . . .
. . . . . . . .
10 11 12 13 14 15 16 17 18

1] Power Led (+)
2] --
3] Power Led (-)
4] --
5] --
6] Speaker (+)
7] --
8] --
9] Speaker (-)
10] Reset switch
11] Reset switch
12] N/A
13] Power Switch
14] Power Switch
15] ACPI Led (+)
16] ACPI Led (-)
17] HDD Led (+)
18] HDD Led (-)

For future reference you can download your motherboard manual here:
(PDF) Soyo K7VKP2

May 09, 2009 | Computers & Internet

2 Answers

Foxconn 760GX K8MC-S


You already have done your best and yet it still does not work... Same problem I have last week... but I have changed the motherboard with anew one and it worked perfectly again... That is I had to break my piggy bank.

Sorry my friend...

Jun 17, 2008 | Foxconn 760GXK8MC-S Motherboard

1 Answer

K7V Dragon Plus motherboard

check front switch jumpers, often if the power switch jumper is on the reset pins on the board will do this, otherwise check power supply, change it if it still does it i would say the power management on the board (ACPI) is corrupt or failed

Feb 28, 2008 | Computers & Internet

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