pauldonson
asked on
CPU fan spins for one second and then stops
This question follows on from this one:
https://www.experts-exchange.com/questions/22060296/New-build-PC-CPU-fan-spins-for-a-second-then-stops.html#17942625
I thought we had fixed the problem but it has returned!
I am using an Asus P5B motherboard with Pentium 4 3.4 GHZ 775 processor and 512MB RAM. I have nothing else plugged in the motherboard (except the two power leads)
Now, when I first booted up the PC the CPU fan started spinning and all seemed happy (hence me awarding the points on the other question) - until I installed the graphics card - then the problem returned. (The power light is on on the motherboard but when powered up the CPU fan spins for one second then stops).
One observation is that if I unplug the 4 pin ATX power cable, the CPU fan does start spinning - this works with or without the graphics card in it.
I think the power button was faulty on the other case (I have got a new one now) - so I think there may have been multiple problems.
As I said before this PC is for our CEO at home and I really need to get this sorted quick! Hence another 500 points on offer.
https://www.experts-exchange.com/questions/22060296/New-build-PC-CPU-fan-spins-for-a-second-then-stops.html#17942625
I thought we had fixed the problem but it has returned!
I am using an Asus P5B motherboard with Pentium 4 3.4 GHZ 775 processor and 512MB RAM. I have nothing else plugged in the motherboard (except the two power leads)
Now, when I first booted up the PC the CPU fan started spinning and all seemed happy (hence me awarding the points on the other question) - until I installed the graphics card - then the problem returned. (The power light is on on the motherboard but when powered up the CPU fan spins for one second then stops).
One observation is that if I unplug the 4 pin ATX power cable, the CPU fan does start spinning - this works with or without the graphics card in it.
I think the power button was faulty on the other case (I have got a new one now) - so I think there may have been multiple problems.
As I said before this PC is for our CEO at home and I really need to get this sorted quick! Hence another 500 points on offer.
ASKER
Bit more info:
I have just powered it up with both ATX power leads in it, no graphics card. I have now plugged in the speaker and the system emits the following "bleeps":
1 long followed by 3 short bleeps
Pause
3 rapid beeps
Nothing
Obviously I can't get see what is happening because the board doesn't have on board graphics and I can't get this far with the graphics card plugged in.
Incidently I have tried a different graphics card (that I know works) and the same problem occurs.
(I have ended up buying two of everything trying to get this flipping thing working!!)
I have just powered it up with both ATX power leads in it, no graphics card. I have now plugged in the speaker and the system emits the following "bleeps":
1 long followed by 3 short bleeps
Pause
3 rapid beeps
Nothing
Obviously I can't get see what is happening because the board doesn't have on board graphics and I can't get this far with the graphics card plugged in.
Incidently I have tried a different graphics card (that I know works) and the same problem occurs.
(I have ended up buying two of everything trying to get this flipping thing working!!)
Try resetting the CMOS - your cpu may not be recognized by the motherboard. Remove all RAM and try it again.
ASKER
OK, I removed the RAM reset the CMOS
It booted up OK (1 long followed by 2 short beeps repeated - which I guess is due to lack of memory)
So, all that was plugged in was CPU.
I added the video card and problem returns (CPU fan and Graphics card fan spin for a second then stop).
Tried different video card, same problem.
I'm getting desperate now...
It booted up OK (1 long followed by 2 short beeps repeated - which I guess is due to lack of memory)
So, all that was plugged in was CPU.
I added the video card and problem returns (CPU fan and Graphics card fan spin for a second then stop).
Tried different video card, same problem.
I'm getting desperate now...
I think you have a bad motherboard. A bare system with RAM and a video card should POST and display the BIOS.
ASKER
OK, so now I have moved the memory and the CPU to another motherboard (Asus P5LD2-VM DH) - this has onboard graphics.
First time I started it up the CPU fan kicked in, but there was nothing on the display - no POST beeps or anything.
Now it is doing the same as the other one, CPU fan spins for a second then stops.
This is getting very frustrating!!!
Any more ideas please?
First time I started it up the CPU fan kicked in, but there was nothing on the display - no POST beeps or anything.
Now it is doing the same as the other one, CPU fan spins for a second then stops.
This is getting very frustrating!!!
Any more ideas please?
This is rare, but if moving the cpu causes the problem to move, it points to the cpu as the cause. Move the other cpu to this motherboard and see if that works.
ASKER
Right, I have put the CPU back into the older PC that it came from and it boots fine, does this eliminate the CPU?
ASKER
And now I have tried a different power supply (one I know is OK) and it is doing the same thing.
It seems to be starting up OK now, but no screen display appears.
It seems I have tested everything - ARGGGH!!!
BTW Should it still go to POST without any memory in it?
It seems to be starting up OK now, but no screen display appears.
It seems I have tested everything - ARGGGH!!!
BTW Should it still go to POST without any memory in it?
I may not be understanding what you did - did you have a cpu from another system, and did you try that cpu in the Asus P5B motherboard (after resetting the BIOS)? We're trying to determine if the new P4 3.4 cpu is at fault.
ASKER
OK, I only have one CPU (the Pentium 4 3.5 GHz (model 550))
This came from the old PC and has been retested in that PC to confirm that it is still functioing correctly, which it is.
So, the current configuration I have is:
Asus P5LD2-VM DH motherboard
1 x 512MB RAM
Penitum 4 CPU (see above)
The board has onboard graphics - it seems to boot intermitantly now (sometimes stopping after one second, sometimes not) - in any eveny no post screen (or indeed any signal whatsover) appears on the monitor.
I have also tried the power supply from the old PC (which we know is OK) and this produces the same result - the only thing that can't be verified independently is the memory (but I have two sticks and have swapped them over to no avail)
This came from the old PC and has been retested in that PC to confirm that it is still functioing correctly, which it is.
So, the current configuration I have is:
Asus P5LD2-VM DH motherboard
1 x 512MB RAM
Penitum 4 CPU (see above)
The board has onboard graphics - it seems to boot intermitantly now (sometimes stopping after one second, sometimes not) - in any eveny no post screen (or indeed any signal whatsover) appears on the monitor.
I have also tried the power supply from the old PC (which we know is OK) and this produces the same result - the only thing that can't be verified independently is the memory (but I have two sticks and have swapped them over to no avail)
ASKER
PS I have given up on the P5B for now as it doesn't have on board graphics - I want to try and get it working on the P5LD2 first which does.
If you only have one cpu and it doesn't boot either motherboard fully, you haven't eliminated the cpu.
You seem to be saying that it doesn't work, but then you are also saying "This came from the old PC and has been retested in that PC to confirm that it is still functioing correctly, which it is." Was it working, and now is beginning to fail?
You seem to be saying that it doesn't work, but then you are also saying "This came from the old PC and has been retested in that PC to confirm that it is still functioing correctly, which it is." Was it working, and now is beginning to fail?
ASKER
Yes, it was working prior to me building the new PC - today I have put the CPU back in the old PC and verified that it boots correctly.
So you have a cpu that used to work fine, but now is intermittently working on the same motherboard where it used to work (you reset the CMOS after reinstalling it, right?). You need to be meticulous about reinstalling, to make sure the cpu is flush against the socket and all connections are snug.
I would try a better quality power supply. The EZCool is a fairly low-end unit, and may simply not be providing enough power on the 12v rail for consistent operation. Get a good Seasonic 600w (or even their new 700w unit).
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ASKER
Thanks for the comprehensive reply thoffman.
There has been a devlopment, a colleague has confessed that he fried the P5LD2 last week (Thanks for wasting my time for two days miate)
So, it's back to the P5B, this one DOES POST without a graphics card but as soon as I put the PCI-E card in I get the 1 second spin thing again.
I think I will try your suggestion thoffman of trying to POST with a PCI graphics card - I will take it from there.
Thanks again to everyone who has contributed so far.
There has been a devlopment, a colleague has confessed that he fried the P5LD2 last week (Thanks for wasting my time for two days miate)
So, it's back to the P5B, this one DOES POST without a graphics card but as soon as I put the PCI-E card in I get the 1 second spin thing again.
I think I will try your suggestion thoffman of trying to POST with a PCI graphics card - I will take it from there.
Thanks again to everyone who has contributed so far.
> a colleague has confessed that he fried the P5LD2 last week
It's no wonder I was having trouble understanding what happened!
It's no wonder I was having trouble understanding what happened!
ASKER