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Motherboard issues L7VMM3

Well i did a repair to fix the Power Supply fan got the exact same kind same volts and everything and just spliced the old one out and put the new one since iv taken a tech course in high school i doubt there is anyway unless i have become color blind latly and can not tell red from black.

Needless to say i hade it hooked up and it was working fine just needed to get the hard drives to figure out what one goes where as i took the whole thing apart.

It booted up but could not read the the one hard drive that was not a problem as it had allways been picky.

Well i turned it off and figured i would go to bed. Low and behold the next day i go to go turn it on and iv lost all video feed iv tryed a few differnt mointors and video cards. some Pci some Agp, no go.
the only thing i think may have been done was somewhere along the way i got a wire or two crossed on the board there is a group of 5 pins and there are 8 wires i am pritty sure i put them back on the same way they came off but i cant be to sure and i dont have the motherboard book with me currently.

So if you would happen to know what order those wires go in they got little plastic sleaves and a few say Prot + and Prot - and then there are a few that say just + and -. So if you got a spare book around lol if you dont mind looking that up for me as i can not seem to find one online.

Regards Scott J -

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Re: Motherboard issues L7VMM3

I thin if u have screwed up with connection u might have screwed up the motherboard is the mother board workig if not ur power in inthe mother have gone dead

Posted on Nov 30, 2007

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No power from gigabyte motherboard


Just basic diagnostic tools

First thing to check IS the Power Supply.
Then the diagnosis goes on.

So far all you have told me is an assumption. You ASSUME the Power Supply is OK.


1) If ALL of the LED's were on at once, they would use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor can draw from 51 to 125 Watts of power.
Just depends on what Processor it is,

By having JUST the CPU on the motherboard, and the fan on the Power Supply doesn't work; you have just PROVED that.

Do you have a multimeter?
An economical one can be purchased for as little as $5 to $12.
Available in a multitude of stores.

There are 3 main voltages to check. Check while PSU is plugged into mobo. (Power Supply Unit; MOtherBOard)

A) 3.3 Volts
B) 5 Volts
C) 12 Volts
All are DC Voltage. (Dotted line over a solid line for Multimeter)

The Orange wires are 3.3 Volts
The Red wires are 5 Volts
The Yellow wires are 12 Volts. All are DC Voltage. (DCV)

The 24-pin ATX main power cable is left plugged into the mobo.
The BACK of the power cable's connector; is where the wires go in.

Power Supply unplugged from power; a straightened out paperclip is inserted down into the socket hole with an Orange wire in it.
The paperclip slides down alongside the insulation of the Orange wire, and touches a metal female terminal.

Every wire going into the 24-pin ATX main power cable's connector, ends in a Molex female metal terminal,

The brass tip openings can be seen, in the Playtool link's middle photo. (Tip openings; Front. Paperclip touches Back)
MUST touch that metal terminal.

Another paperclip is slid down into ANY socket hole, with a Black wires in it.
ALL Black wires are Ground wires.

Making sure the paperclip jumper wires, are of the correct length by cutting; there is no way they will accidentally touch each other.

Positive (Red) probe lead of multimeter to Orange wire paperclip;
Negative (Black) probe lead of multimeter to Black wire paperclip.
You should read 3.3 Volts (DC)

Do the same for the Red - 5 Volt wire. Red wire and Black wire.
12 Volt - Yellow wire and Black wire.

Post back in a Comment.

On another note;
Did you just recently mount the mobo to the computer case?
Did you use metal Standoff's, or plastic Spacers?
(Standoff - Hex shaped brass piece, usually 1/2 inch tall; and with a threaded hole on one end, and a threaded shaft on the other)

The Support Plate can be a separate metal plate; or is an integral part of the computer case.

IF, there is a Standoff on the Support Plate, that is NOT lined up to a motherboard mounting hole, it can touch exposed solder joints on the bottom of the motherboard.

This will short circuit the motherboard. MOST of the time when the 'offending' Standoff is removed; everything is OK.

Dec 25, 2012 | Motherboards

1 Answer

Cooler Master 1000w Silent Pro M not compatible with MSI MS-7548 (Aspen) motherboard?

So you're using the same CPU 4+4 Pin x2 power cable on both rigs?
(One of them)

Yes, I see it's a modular cable design, and the CPU 4+4 Pin x2 power cable, can be used as a single 4-pin ATX +12 Volt power cable,

ALL Yellow wires are 12 Volt (DC) wires.
ALL Black wires are Ground wires.

ALL 12 Volt wires go to ONE single 12 Volt power rail, in the Power Supply, BUT; there is nothing saying an individual Yellow wire may be bad.
This is why I wondered if you are using the SAME power cable CONNECTOR. Same power cable.

Then suggest it has something to do with the Active PFC circuit.

Not aware of any setting to change in BIOS Setup utility - Power.

BUT, I do not know everything! lol!

IMHO there is no reason it will not work, unless as said; something to do with the Active PFC circuit.

From here let's hope someone who really knows what is going on, will post.


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1 Answer

My custom built computer has a the m7vig400 installed and i can't formatt my new harddrive because the fan on top of my processor will not come on why ? it came on with a 16 head hard drive how do i...

First, make sure you plug the power from the fan back into the motherboard & try it again. Did you do anything else besides just pulling out your old hard drive & putting the new one in? The CPU fan is completely independent of the CPU fan. You can start up you system without ANY hard drives & the CPU fan will come on if it's plugged in & the power supply is working etc. If you make sure the fan is plugged in correctly & the fan still doesn't come on, I suggest you temporarily put your old hard drive back in & firing things up. I'm sure you will find that the fan still doesn't work.

All that said, if the CPU fan isn't working (& everything else is), then it's a bad fan or motherboard. It's not necessarily a bad motherboard. Sometimes there are jumpers that control that sort of thing. I'm not sure exactly what that motherboard does. I have had this exact motherboard for years & as long as the fan is plugged in (& the power supply is working), when you start things up, the fan comes on.

One last thought, try flipping the power supply switch in the back to reset the power supply before you press the button in the front. Good luck...

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1 Answer

Computer power supply has 5.12 volts steady, front light blinks continuosly. Nothing comes alive, fans, this a motherboard or supply issue?.

Test your PSU or replace it if your power supply units fan is not working your PSU is faulty

One bad lead can cause a computer to fail to detect a hard drive continue on a cycle or to shutdown

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA and

the leads from your motherboard to your hard drive make sure they have a secure connection and are not faulty or just replace them there probably old and faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty or just replace them they are probably old and faulty ?
hope this helps

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Just bought a new motherboard and have hooked it back up nothing happens when powered up fans come on notheing else

1. You may have a power supply issue.
2. Try removing the power supply and replacing it with a know good one with the same specifications.
3. the power supply is giving the +12 volt to the fans but not to the rest of the board.

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I have a L7vmm3 motherboard - everything is

If you have onboard video disabled in BIOS, then the driver can't find the video chip.

Enable onboard video in Bios and you should then be able to install driver.


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Not power on.

I will assume you confirmed power at the outlet. so is there power coming out of the power supply? if yes then the problem is the MOBO

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1 Answer

Emachine T2890 won't power up. New power supply.

move its bios jumpur on cofig mod and after some time post it its orignal post .it will ok ok Insha Allah

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3 Answers

Cpu fan wont come on after new power supply put in

what made you change the power supply to begin with? Most cpu fans run off the motherboard, but the motherboard initially gets all voltages from the Power supply to begin wth. Did you assume that because cpu fan wasn't running to begin with, that the original power supply was bad. Not a bad assumption but one that needed verification before changing out a power supply. So it seems at this point that you have an unverified bad power supply, a possible bad motherboard, and a known good cpu fan. Plus at ths point you really don't know of the new power supply is good yet until you see something electrical run with it.

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7 Answers

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cheak and change ur power supply

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