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Mobo boots randomly bad voltages PSU,RAM GPU is good

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  • Master
  • 3,400 Answers

TRY WITH A OTHER PSU.

Posted on Jan 01, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

DickCanFixIt
  • 948 Answers

SOURCE: Computer turns on...no post beeps, no display

Could be motherboard, could also be power supply. I would try a different power supply before I changed the motherboard.

Posted on Apr 05, 2009

  • 94 Answers

SOURCE: recommended psu wattage inreplacement to 300watts psu for asusp4p800s-x

Did you just replaced your video card with a new one? What other peripherals/accessories do you have inside your CPU besides your VCard? Higher video cards and more accessories means you need more power. If not, your PSU is busted. You can use a 450watts PSU for Pentium4 or just replace your PSU with a new one.

Posted on May 28, 2009

  • 157 Answers

SOURCE: Crash and reboots randomly

Carefully wriggle wires on the back of the PC, one at a time. A card (like video) could be loose. Also, make sure the heatsink/fan is clean, and running. It might be time to reinstall your operating system (I bet it is microsft). If you have another HD, you could install windows on it in your sys, and see what happens.

Posted on Aug 24, 2009

  • 12 Answers

SOURCE: after psu burned out , can't boot computer with

You might Have a Short on your Mobo, switch around your Jumper Config, check for any metal material touching any traces :]
hope this helped!
(try reseting stuff aswell, when things vibrate they move IE: chip creep)

Posted on Sep 04, 2009

map9966
  • 2351 Answers

SOURCE: Odd PC Build Bootup Problem::

Instead of connecting you're fans to a single 4-pin molex on the power supply why not use the motherboards 3-pin molex fan connectors coming off the motherboard. See page 2.2.4 in your manual. Though I agree you should still be able to run 4-pin molex connectors to all fans off of you're PS. Allow the mother board to supply the 12v current to you're extra fans.
CHA_FAN1
CHA_FAN2
CHA_FAN3
CHA_FAN4
You're motherboard will supply the needed power. Less wiring will also allow better air flow through out the system and less strain to the fan controllers.
4-pin molex to 3-pin female; http://www.avadirect.com/product_details_parts.asp?PRID=11410
OR
http://www.microbarn.com/details.aspx?rid=101317&source=froogle

Happy New Year!
Mike

Posted on Dec 29, 2009

Testimonial: "Very informative and just what I needed to hear, thanks!"

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Though it had been working fine until two days ago, my HP z800 won't boot past the "Starting Windows" animation; it simply turns off during its usual lengthy but verbose boot.


a HP z800 Desk top., full sized too.
what options? what does it have inside, now. ok 1 VGA card now. but is there a CD/DVD or BR disk drive there? options?
running SSD ! good.
its sold with a wide range for RAID drives, options.
and dual Quad-Core Intel Xeon Processor 5500 Series.

7 huge drive bays,
ever think to boot to a Linux CD? LIVE (no HDD need be there)
or windows 7,8,10 LIVE PE windows disk. (no HDD need be there)

my guess is if that fails (above simple test), then the PSU is bad.
it turns off for only these reasons.
1: the OS told it to.
2: the PSU saw errors and turned it self off.
the cause list is huge. (even bad MOBO, bad ram, or anything plugged into that MOBO that is shorted.

The PSU if it sees faults on any of its many power bus lines
it shuts off as after 1full second of trying to get it right (ATX spec)

why not just strip it down to only
mobo,PSU, no vga? , 1 mem stick.
see if fans run, powered on and it holds, there.
have as little plugged in to MOBO is possble
see if you get beep codes or , plug in 1 USB keyboard
and see if the LED there have flash codes.

ever seen a live boot CD? or stick
today all techs, have a boot stick, i have 4,
that why we can test everything out, with no HDD present.
see the POWER OF THAT?

I take a LIVE PE or linux, ISO file and burn a USB stick with RuFUS.
then boot to it, keep it in the tool box. and be empowered.


The PSU when working, some dont shuts off for 2 reasons
Power bus overloads, over/under voltage tests, or the soft power off
bit is TRIPPED.
if no HDD present there will no soft power off , possible. dig?
you push the power button and the PSU must stay up
do the fans go off too, ? you never mentioned FANS.
mine has 4 fans,
if the fans good off, now HDD then the PSU is bad or just UNHAPPY.

unhappy means, OVELOADED.

The more fancy the PSU, the more possible ways to overload
they do that to keep from blowing to kingdom come, $500 set of
processors. (a good thing)?

one more hint, the PSU has this one wire.
called PWR-OK if the PWR-oK goes false, the PSU
shuts off.
learn how this works and all else is easy.

Jun 18, 2017 | HP Computers & Internet

2 Answers

Mainboard: g31 m7 te - power: antec hcg750 - gpu: gtx560ti


No the mobo is compatible with the Power Supply, and GPU.
And vice-versa.

Mainboard fan???????
You mean the Processor (CPU) fan?

I'm guessing I guess, because computer case fans aren't on the motherboard/mainboard/mobo.
(MOtherBOard)

You're getting power to the mobo, but the question is how much?

1) IF ALL of the LED lights 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 use from 51 to 125 Watts of power.
Just depends on what Processor it is.

http://206.108.48.60/app/en/mb/introduction.php?S_ID=363&tab=1

The mobo will support Intel Core2 Quad-Core processors. Depending on which one, you may be talking about Up To 105 Watts of power,

http://en.wikipedia.org/wiki/List_of_Intel_Core_2_microprocessors#Quad-Core_Desktop_processors

This is why LED's can light, and fans may spin, but the Processor isn't getting enough power, so the computer will not turn on. (Processor isn't turning on)

Why?

1) Just because that Power Supply is new, doesn't mean it is good.
Sometimes you get a bad one. Test the three main voltages coming out, with a multimeter set to DC Voltage.

Need guidance post back in a Comment.
(An economical multimeter can be purchased, for as little as $8 to $12. I have seen cheaper. Available in a multitude of stores. An auto parts store is but one example )

2) You don't have the 4-pin ATX +12 Volt power cable plugged in.
Goes to the white square 4-socket hole connector, to the left top corner of the Processor socket.
(Motherboard installed in computer case)

3) REQUIRES -> TWO 6-pin PCI-Express power cables, for the Nvidia GTX560Ti graphics card.

The Antec HCG750 PSU has 4 of them, so no problem there, IF you have two of them plugged into the graphics card.

Both connectors of the 20 + 4-pin ATX main power cable's connector, need to be used. Biostar mobo requires a 24-pin ATX main power cable.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817371049

Post back in a Comment as to power cables plugged in, and DC Voltage test on PSU.

Regards,
joecoolvette

Aug 06, 2012 | Biostar G31-M7 TE Motherboard

1 Answer

Satellite L505-GS6000


Make sure you have the up to date drivers it may just be software!!!... but this sounds like your GPU chip is geting a bad connection to mobo.. A reflow of GPU may help,, if not a new mobo is needed.

Jan 11, 2012 | Toshiba Computers & Internet

1 Answer

I have a Compaq Presario SR1830NX desktop, I leave it on all the time, when I got up this morning, it was off, so I pressed the power button, but it doesn't power on, nothing happens.. I checked the power...


step 2 the TECH uses a voltmeter and checks all wires on PSU for correct voltage.

PSU in Desktop dead, my guess fans dead too right>
you never said, what it does inside PC ,except nothing
does nothing mean dead silence?
the fan must run for 1second, then goes off.
a 1 second run tells me the PC power switch told the MOBO to turn on and in turn it tells the PSU to turn on,
the PSU then turns on for at least 1second,and if the voltages are ok
then the PSU stays on, else off goes.

15 and 16?
the 20 pin older supplies those are both ground
but 24 pin ATX pins are correct there.
the voltages are here.
https://en.wikipedia.org/wiki/ATX


There are 2 causes, of dead power button.
1: the buttons 2 wire cable ends fell off. at button or PC mobo.
2: The PSU is bad.
3: the MOBO is bad.

The mobo can also shut off any PSU, if the PSU fails
or it sees the regulators in the MOBO fail.
the Desktop runs on many power rails.
some in the PSU, others on the MOBO.
THe mobo creates special low voltage for the CPU.

the power good pin, does that #8,
One way to see if the MOBO is overload
is to remove things from it, I start at RAM
lacking a voltmeter, this is very hard to fix any thing electric.
only guessing or pulling objects PC can find shorts.
pull all power cables there, hdd, power, cdrom.
all things that use red/yellow wires.
all SATA cables, all USB , then ram. even a fan can short
a good tech keeps an open mind, and finds why the PSU shut down.
in most cases, the PSU is bad. but not always.

This is a feature, of ATX it keeps you from blowing up say a
$300 microprocessor.... or fancy gaming Video card (have one)?
yes, pull the video card too.

Jun 25, 2017 | HP Compaq Presario SR1630NX PC Desktop

1 Answer

Video freezes on hp e9105z on a random and intermittent basis Nvidia gt 120 video card


Test these three things:

1 - GPU could be overheating, can you swapp your video cards with a known working card?

2 - PSU could be bad, again try swapping with known working PSU, makes sure card is recieveing proper input power.

3 - I have seen a bad ram module do this before also, but, try reseating the RAM, run memtest86 for errors

Great testing tool, HIRENS bootCD

http://www.hiren.info/pages/bootcd

Oct 22, 2009 | HP Pavilion a6700f PC Desktop

2 Answers

After psu burned out , can't boot computer with


see your cpu fan connector, weather it is connected properly. to check wether psu is working properly, short the black n green wires present in the psu's mother board connetor by using a single strand wire, and switch on. if the fan rotates there is no probs with the the psu. then u will have to replace the motherboard

Sep 04, 2009 | Gigabyte Computers & Internet

1 Answer

Crash and reboots randomly


Carefully wriggle wires on the back of the PC, one at a time. A card (like video) could be loose. Also, make sure the heatsink/fan is clean, and running. It might be time to reinstall your operating system (I bet it is microsft). If you have another HD, you could install windows on it in your sys, and see what happens.

Aug 24, 2009 | ASUS P5NSLI (0610839134670) Motherboard

2 Answers

Recommended psu wattage inreplacement to 300watts psu for asusp4p800s-x


the needed wattage is directly linked to the componets you want to use other then the mobo itself. the main power surges are the CPU (takes 40 to 110 Watts) a graphics card (from 5 to over 150 Watts) the Drives (about 25-30 Watts eachs), the RAM and all the other addons and gadgets you build into your PC. Just add the different Wattages together and give it quiet some headroom. I usually drive this kinds of mobos with 400-550 Watts PSU to be on the save side, if i use a more or less "standard" graphics card, and even more with high sophistcated cards or lots of drives or such.

if you "see" low power (Volts) it might also be a problem with a partwise defective PSU.

May 28, 2009 | Intel ASUS P4P800S-X 848P Socket 478 DDR...

1 Answer

Tyan S5396 and Thermaltake 1500W


tyan i5400xt.. to test for ground.. pull the board from the chassis and test with a different known good power supply

if the boot works... then you have a power supply issue...

does the board have a post code lighted signal ???

if so.. a bad power supply should goto FF error code

verify you have enough power on the cpu rail with your power supply specifications also

be sure you have all cables 4 pin 8 pin and 20/24 pin connections done correctly.. lastestly check if the board is touching the chassis edge anywhere... could cause a ground

also take and loosen all the MB screws from the chassis.. just let it hang there this will test the grounds needs the screw connections

mark@omces.com

tyan specialist

Oct 31, 2008 | Tyan S5396A2NRF Dual LGA771 XEON5000 5100...

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