• Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
    Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.

Fried PS or mobo?

F

FrozenLava

n00b
Joined
Sep 18, 2003
Messages
25
I've been running an Asus A7V-8X (I think, it's been a while) for the last few years, and am having a little issue. When I press the power button, everything lights up for a split second and then shuts down immediately. Pressing the power button again does nothing, unless I turn off the PS, and turn it back on a couple seconds later, and then the same process repeats. It's a fairly new power supply, so I'm thinking this may be the mobo instead? Thoughts? I've been thinking of upgrading but don't really have the cash at the moment.

I don't know how it died, I just came home one day and it was off.
 
What power supply do you have? Just because it's new doesn't make it any less of a culprit.

Do you have a spare PSU that you test with?
 
FrozenLava said:
I've been running an Asus A7V-8X (I think, it's been a while) for the last few years, and am having a little issue. When I press the power button, everything lights up for a split second and then shuts down immediately. Pressing the power button again does nothing, unless I turn off the PS, and turn it back on a couple seconds later, and then the same process repeats. It's a fairly new power supply, so I'm thinking this may be the mobo instead? Thoughts? I've been thinking of upgrading but don't really have the cash at the moment.

I don't know how it died, I just came home one day and it was off.
Click to expand...

Probably neither:

http://www.hardforum.com/showthread.php?t=1360740

Sound familiar? Too many of these issues are cropping up and I am trying to come up with one common denominator to explain it.

To date I have found two 4 pin Molex to 3 pin fan adaptor issues in two different machines. I also found some offending fans along with a few pinched wires.

Look a little deeper but there just can’t be this many bad boards from so many companies and PSU manufactures;)
 
Funny, I'm currently having the same problem with too old reliable Socket 478 motherboards where it boot up with the fan and leds on, but no screen activity on the monitor despite having swapped through more then 5 gfx cards.??!!!
 
I tried a new PSU as well, still same deal.... I'll try pulling everything and see if it boots.
 
Matthew Kane said:
Funny, I'm currently having the same problem with too old reliable Socket 478 motherboards where it boot up with the fan and leds on, but no screen activity on the monitor despite having swapped through more then 5 gfx cards.??!!!
Click to expand...

Now that is a very different issue. Your fans run but in the cases here the fans and led only stay on for a split second and get a shut down.

Do you get the “beep” indicating a “post”?
 
Alright, I tried pulling everything from the mobo, besides the CPU, power connector, and the power switch. Still nothing. I even tried removing the switch and shorting the wires manually in case the switch was defective. Tried with both power supplies. I pulled EVERYTHING, including all cards, RAM, everything from the rear outputs (monitor, speakers, everything). I tried removing the CPU fan from the mix, still no boot. I ordered a new system, since it was about time to upgrade anyways, but I think it comes down to either the mobo or CPU.
 
My guess is mobo.... we have 55 machines here at work with ASRock motherboards in them(almost 4 years old)... I have had prolly 5 or 6 go in the last 3 or 4 months.... all exhibited similar behavior to what you are explaining, and all were motherboard related. Seeing as ASRock and Asus are sister companies, that would be be guess.
 
BillR said:
Now that is a very different issue. Your fans run but in the cases here the fans and led only stay on for a split second and get a shut down.

Do you get the “beep” indicating a “post”?
Click to expand...

Nope no beep whatsoever....
 
My immediate thought was the PSU, seen a few systems PSU's go that way, seeing as you changed it, I'd say the mainboard is the culprit. To be safe plug in one device and then power it on, then plug in another and so on, maybe it's one component preventing the power up.
 
Matthew Kane said:
Nope no beep whatsoever....
Click to expand...

Ok, your fans run so we can (for the moment) assume you have 12 volts. Do you own a voltmeter to check the 3.5 and 5 volt rails?

I have seen a few LGA-775 CPUs work after a re-seat, that whole socket thing, to me at least, leaves a lot to be desired.
 
yeah I think I'm getting perfect 12v or 11.89 or something like that and I have used the same PSU on another skt 478 Gigabyte motherboard and its working fine. I have swapped out the cpu for another one, no affect, swapped and tried with 1 module ram and 2, no affect and I've tried gfx card as well, no affect...the led is up and the fans are running, but no god damn display on the monitor. And the only way to shut down the system is by flipping the switch on the PSU to 0 which is off, the button on the case don't even work. This same thing applies to the 2nd skt 478 board as well. I just don't get it how it just stop working all of a sudden. Could it be that upon past events of flipping the PSU switch to 0 killed or burned some resistors on the mobo? Or killed a specific component? I know the motherboards are not dead, as I have checked thoroughly already and no signs of burnt or black spots or blown caps or melted mosfets. I know its not dead coz I had a customers lag 775 P4 system in b4 and she said it wouldn't start up, upon opening the case and looking under the NB HS and the under the cpu socket area showed black and burnt spots on the purple ECS mobo.

So whats the problem? I haven't tried it with another PSU but. Should I give that a go?
 
Have you tried taking the board out of the case? Maybe something shorted out. I had an ECS board that didn't work right for a while until I took it out and ran it seperately. Then I put it back in and all was OK. I must have messed something up on installation.
 
Take a look at the capacitors around the CPU. Are there any that are oozing stuff or have crust on them or even just a little domed out at the top?

If the capacitors look fine, pull your CMOS battery and check the voltage with a voltmeter. I've had several boards that refuse to POST unless the CMOS battery is at least 3V.

It could also just be that the board finally died. :)
 
pgaster said:
Have you tried taking the board out of the case? Maybe something shorted out. I had an ECS board that didn't work right for a while until I took it out and ran it seperately. Then I put it back in and all was OK. I must have messed something up on installation.
Click to expand...

how??
 
1st: I have been running the board the outside the whole time.
2nd: Yes their isn;t any blown capacitors and if their was, I would've replaced it ages ago.
3rd: Right before the problem happened, I was doing a little oc experiment to see how far a 2ghz celeron can go up just by increasing the fsb in the bios without voltage increase, and as soon as the board booted up 4GHZ (an amazing 100% unstable overclock) I went into the bios again and tried for 4.1 but it failed and nothing came up on the screen. Shut down the thing by switching off the PSU power button and booting it up again failed but all leds and fans still spin up when I power it up by the turn on button. During all this I had not been using a battery in the cmos, but I was kinda confused how it actually still recorded the overclock increase speeds with out the cmos battery. And yes I have tried adding a cmos battery and it still doesn;t work. So I've yet still to try it again and retest the board and find out the culprit.
4th: The board is not dead! If it was, there wouldn't be any leds on or fans spinning perfectly!

The thing that got me, is that could it be I killed one of the small square resistors on the board or the voltage regulator module or the pll chip??
 
I dont want to hijack this thread but I did a search with my problem and this seemed like a good place to post instead of creating a new thread.

I have been running a Antec900 with Abit IN9 32X-MAX/8800GTX SLI powered by Corsair 620 modular PSU with no problems or glitches. I havent touched it or done any overclocking for awhile. Tonight it was running at idle and just shutdown for no reason. Initially the mobo LED light stayed on but it would not start again. I then unplugged it to try and reset and now I dont even get the LED light on the mobo. Anyone have any suggestions for a quick fix? Does this sound like a PSU problem? I know the easiest thing to do would be to try another PSU.
 
Matthew Kane said:
4th: The board is not dead! If it was, there wouldn't be any leds on or fans spinning perfectly!

The thing that got me, is that could it be I killed one of the small square resistors on the board or the voltage regulator module or the pll chip??
Click to expand...

Just because the fans and LED's come on doesn't necessarily mean the board is working properly, for all we know there could be a blown trace within the board (since most boards have 2-4 layers of PCB), I have seen plenty of systems with board failures and still power on everything else regardless...in fact I have an old system at home with a fresh PSU, system spins up but there is no life beyond that due to a power surge.

Since you were over clocking have you tried resetting the CMOS manually with the jumper (or a paperclip to bridge the solder points if the pins are missing), or even tried a different CPU to make sure the processor didn't get fried?

Those are my final two suspects in the troubleshooting, bad board, bad CPU...or three if you haven't taken out any other components to troubleshoot the system and just kept trying to power it on and off.
 
Im not getting any type of LED lights on the board right now.

I did the paperclip green and black pins and nothing happened so Im guessing its the PSU.

How good is Corsair about replacing these?
 
solaris54 said:
Im not getting any type of LED lights on the board right now.

I did the paperclip green and black pins and nothing happened so Im guessing its the PSU.

How good is Corsair about replacing these?
Click to expand...

If you are not getting any lights it is possible your PSU shut down in safety mode. You might have to pull the plug from the wall for a few moments to get a reset. Maybe even a min or so.

I'm not saying it isn't psu, but what you have is actually hard to break;)
 
BillR said:
If you are not getting any lights it is possible your PSU shut down in safety mode. You might have to pull the plug from the wall for a few moments to get a reset. Maybe even a min or so.

I'm not saying it isn't psu, but what you have is actually hard to break;)
Click to expand...

I did leave it unplugged overnight and still no help.

Yes this is why Im baffled that this PSU might have failed:confused:
 
Hello, thought I’d add to this thread as my issue is very similar:

1. Same symptom where the fan starts to spin for a second then stops
2. Interesting twist is that if I unplug the CPU 4pin connector (it’s a Pentium P4 CPU) then all the MOBO components are fine in that the fans spin, the CD drive spins, video card fan spins, etc. Of course, no CPU power so no POST
3. With a replacement MOBO in the case, the same CPU, gives the same symptom
4. Original MOBO in case with a replacement CPU, same symptom
5. No, I haven’t tried these MOBOs out of the case, and I will
6. I checked the 4pin connector and I get 12V – could this be an AMPs problem in that there is not enough amps to power everything?
7. PSU is a Thermaltake 400W about a year old
8. System was running just fine for a year then one day, while in use, powered down and hasn’t recovered
 
this thread went off track but i figured I would post what I think is my problem. On the mobo, right near the very bottom (by the blue USB pin header) there is a cap. Right beside this cap, there is what appears to be a fuse. Mine is utterly destroyed, I'll try and take a pic of it later. I'm going to try and remove the fuse, and just solder the gap closed. If it fries I don't really care, so we'll see what happens.

edit: Whatever it was just fell apart when I touched it, i was able to just blow it off the board. Whatever shorted but have had some good current flow because the area around this is charred pretty bad, it probably took out a couple of resistors right beside it at the same time. The cap looks to be fine. Soldered the gap closed, but I still get the same symptoms. So the board is toast.
 
New efforts:

1. New PSU did not solve the problem - same sympom where the fan spins for a momen then nothing.
2. I tried a new mobo outside the case with the old CPU and the fans all spin just fine. Working on getting a POST now.

Question: If there is a short inside the case how would I diagnose it? You see, when to mobo is inside the case I get the fan spin for a moment then nothing. Any help appreciated.

Sorry if I hijacked this thread however the symptoms were similar.

Thanks in advance.
 
Exactly what I have tried but its got to be one of the small components on the motherboard being completely destroyed.
 
Update:

After reading the forums it looks like my original PSU is crappy and has problems delivering enough AMPs on the 12v "rail". It is a Thermaltake Purepower 500w and like an idiot the "second" PSU that I tested with is a Thermaltake Purepower 430w which may have the same problem. So, perhaps this is a PSU problem however I am still testing. I think I'll take back the seconds PSU and trade it in on another one like a Corsair or Silverstone.
Michael
 
You must log in or register to reply here.
Back
Top