Question about Biostar K8M800-M7A Motherboard

2 Answers

Power supply and CPU fan problem

I am installing a new motherboard and when I plug in the power cord the power supply and CPU fan come on without me pressing the "On" button....help? What have I done wrong?

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  • Anonymous Nov 01, 2007

    I have same problem.

  • Anonymous Nov 08, 2007

    I have a same problem.

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2 Answers

I did anyting. But, problem is same.

Posted on Dec 25, 2007

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  • Master
  • 656 Answers

You dint mention the mother board u are using in some motherboards jumber setting can power up the system check the jumber setting in the mother board near ur front pannel pins in ur motherboard

Posted on Nov 30, 2007

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Posted on Jan 02, 2017

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2 Answers

I rebuilt computer with new parts, now won't start up. No POST. Power LED lights up, no cpu fans spin, no beeps. Psu works with paper clip test. New mobo, ram, psu, cpu.


Check display without cabinet maybe motherboard getting short with cabinet and try new Power supply check all the power supply connectors connected or not .

Nov 14, 2016 | Computers & Internet

1 Answer

Turn on problems


check power supply then make sure that the main power cable is in plus the 4 pin and 24 pin are the main ones first then hard driver then cd or dvd rom cpu plug as well on board it says cpu fan try new power cord as well

Dec 25, 2013 | Computers & Internet

1 Answer

Hi i have an r630 desktop and it did work but now i have no power to motherboard no fans cpu but i do have power to the hard drives and rom replaced power supply same problem


Maybe your motherboard is toast.

When you plug in the power cord is there any lightswhatsoever on the laptop, where the plug goes in or on the AC Adapter of thepower cord?

When you press the power button do you hear fans running, hard drive spinning,lights on the computer, hear any beeps or lights constantly blinking, hear theDvD/CD drive click and the light on the drawer of the DvD/CD turn on for asecond or two? If so the laptop is trying to boot or may have booted, butthe screen is not showing for some reason.

Beep tones and blinking lights tells the technicians what is going on with thelaptop and why it is not booting. Most times it's a motherboard issuewhen you hear beeps or blinking lights continuous.

Maybe your power cord is bad if you don't get anything to happen whatsoeverwhen you press the power button. And if that's true maybe you wasoperating off the battery the last time you had it on and since the power cordis bad, it was not charging the battery so the battery is drained and the powercord is bad.

Maybe you have a Static Charge Buildup. Remove the Power Cord, Remove theBattery, then Press and Hold the power button for 30seconds. After 30 seconds plug the power cord back in (leave the batteryout) and hit the power button to see if it boots. If it does, you can putthe battery back in and let it charge.

Mar 30, 2012 | Computers & Internet

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...

Jan 07, 2011 | Biostar M7VIG-400 (M7VIG 400-COMBO4)...

1 Answer

My CPU Fan and Power Fan is spinning just a moment!! firstly , i check RAM, CPU Fan and CPU and then Power Supply... but all of parts are good !!! i think , this problem is possible because of my...


It's not the RAM.
It's not the CPU.
It's not the power-supply.
Turn the computer off.
Disconnect the power-cord.
Disconnect the power/data cables from the 3.5" diskette drive, the disk-drive, and the CD-ROM drive.
Disconnect the mouse.
Disconnect any printer.
Remove any USB devices.
Reconnect the power-cord.
Turn the computer on.

If you still have the problem, then it MUST be the motherboard.

Sep 27, 2010 | ASUS P5G41M LE Motherboard

1 Answer

Fans run without turning on front switches


Hi Gene,

If you've installed the cpu and hooked the fan to the power supply plug, which is just left of the cpu mount, then the board if connected to the power supply cables, it should start up. Regardless of the front switches. However, you probably don't want to start plugging in the power cord until you have all of your components in place and ready to close up the case. First you can create a shock by just touching the board and that can damage the board. (I speak from my own experience :-( .

But once you get the power switch plugged into the board that should take over turning the rear power supply on and off (Including the cpu fan)

Good Luck and don't forget to leave a rating, based on my solution.

Thanks Mark

Apr 16, 2009 | Intel D865PERL Motherboard

1 Answer

System will not start up. Cpu fan spins once, then nothing.


It is more than likely that when your old power supply died a death, it damaged some components on the motherboard. Replace the Motherboard and chip, and you should be back in business. You can pick up some good value bundles to save money on buying the parts seperately. The power supply working again after turning off and on, is because there is a little trip in the power supply that triggers when it detects a fault. Powering down resets that trip allowing it to try and work again.

Mar 05, 2009 | MSI K7N2 DELTA2-FSR NVIDIA nFORCE2 ULTRA...

2 Answers

Asrock P4i65G Motherboard


If the CPU is dead the problems can be
  1. no power
  2. no fans etc or
  3. power, no beeps (errors)
If the Ram is not compatible it would be constant beeping.

With the board in, and power supply 20pin + 4pin Pent 4 power attached,(#2 and #7 of motherboard layout) remove power cord from power supply.
CLRCMOS0 allows you to clear the data in CMOS. The data in CMOS includes
system setup information such as system password, date, time, and system
setup parameters. To clear and reset the system parameters to default setup,
please turn off the computer and unplug the power cord from the power
supply. After waiting for 15 seconds, use a jumper cap to short 2 pins on
CLRCMOS0 for 5 seconds. Remove the jumper. Remove heatsink and fan from CPU. disconnect cpu and reseat it. Re-install heatsink and fan. Plug in the power cord. Try to boot up. If it still does not boot and (no power, no fans etc.) problem would then be cpu is fried.



Jun 02, 2008 | Computers & Internet

1 Answer

Compaq Presario 4400us


Either the new power supply you purchased is not functioning correctly. But, assuming it is now that you are getting some form of power to your PC, it is very likely the motherboard. Whatever fried your old power supply (or it could have just been the power supply itself) most likely fried your motherboard in the process. Probably not the CPU since the MB can't even post.

Jun 21, 2007 | Compaq (388746-001)...

1 Answer

No respons at all !


I think your power supply cables is not able to start your B-board if your power supply is working properly then check mother board jack where you insert your power supply plug in M-board. Then you have to change or repair that jack where you insert power supply wire in M-board. With best regards M. Khalid Shaikh from Pakistan Mobile: +92-332-2631983

Sep 19, 2006 | Intel Desktop Board D845BGSE Motherboard

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