PC won't boot sometimes. Need to push the cpu fan a little. What to do?

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Samkuro

Commendable
Mar 19, 2016
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Hey guys! I'm new to pc building. Recently, I built my first PC rather than buying a pre built one because I thought I could save a couple of bucks. Sadly, it didn't go pretty well. My PC doesn't boot up sometimes. I would need to push the cpu fan before it boots up. By push, I mean, I need to give my CPU a CPR. Lol. At first I thought it was because of a faulty stock fan so I bought a new one and replaced it. I even updated the bios to the latest. Still the same issue. What seems to be the problem? I'd appreciate any help. Thank you!

Mobo: ASUS H97 Pro Gamer (latest bios)
CPU: Intel i7 4790
Ram: Kingston 16gb DDR3 (2x)
GPU: GTX 970
PSU: true rated 700w
HDD: Samsung evo 850 ssd
 
Solution
Shaun o
With Asus model motherboards.

In the bios you get a fan monitoring system.

The fan is not spinning in most cases because of the setting in the bios for it.

When you get the system to work, enter the bios of the motherboard, make sure you are in the advanced options of the Uefi bios.

Go to the fan profile section and set the mode to medium or high as the fan profile for the cpu fan in the system.

If you scroll down the same page in that bios menu selection you should see the fan monitoring option.

Set the Rpm speed of the cpu fan to its lowest setting you can, and any system fans you may have.


The board may fail to boot for two reasons, the fan profile if selected as low may not be feeding enough voltage to the cpu fan in order...
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Someone Somewhere

Someone Somewhere

Titan
Sep 23, 2012
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Try pulling out and re-seating the CPU. Make sure that you put the locking bar all the way down, and it gets under the little hook.

Check the memory and GPU are seated properly - you might be flexing them a little.

PS: What brand/model is the PSU? Haven't heard of 'true rated', though I think Antec has a line called 'True power'.
 
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Samkuro

Commendable
Mar 19, 2016
2
0
1,510


I already tried removing everything. Even the mobo from the case. After rebuilding it from scratch, still no luck. My PSU is Deepcool Aurora 700w. Everything is still under warranty though. I just want to make sure I return back the right one, whichever is causing the problem because I bought them over the internet. It would take a month to get a replacement. Thanks for the response by the way.
 
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Shaun o

Shaun o

Illustrious
Oct 7, 2007
6,113
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41,960
With Asus model motherboards.

In the bios you get a fan monitoring system.

The fan is not spinning in most cases because of the setting in the bios for it.

When you get the system to work, enter the bios of the motherboard, make sure you are in the advanced options of the Uefi bios.

Go to the fan profile section and set the mode to medium or high as the fan profile for the cpu fan in the system.

If you scroll down the same page in that bios menu selection you should see the fan monitoring option.

Set the Rpm speed of the cpu fan to its lowest setting you can, and any system fans you may have.


The board may fail to boot for two reasons, the fan profile if selected as low may not be feeding enough voltage to the cpu fan in order for it to spin.

There for if fan monitoring is enabled in the bios and set to a value of 800 rpm or more.
With the fan not spinning it presumes the fan is broken.

And as a safety feature it prevents the system from booting.

May I also suggest that you check the bios reset jumper pins of the motherboard to reset the bios back to factory defaults.
Look at the manual that came with the motherboard, it will detail where the bios reset pins are on the motherboard.
And it will also state if of the three pin type what two pins must be bridged by a jumper for normal operation of the motherboard bios.

If you have the jumper bridging the two pins that reset the bios constantly it can be the cause as to why a system does not boot or fans do not seem to spin.

Also make sure you have connected the required eight pin 12v E-ATX power block from the PSU to your motherboard as this will also prevent the motherboard from booting right, and can also produce the symptom of the case fans not spinning right.

There is your check list Sam , look at each one. and I suspect it will resolve the problem you are having ok.
There all of the key points to look at when a system acts funny at first time power up of it, and board errors or failure to post to bios test and display modes.

Before you start to send parts back.

 
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