PC wont turn on first try.

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kristusea

Honorable
Dec 8, 2012
47
0
10,530
Hello
My PC started having issues since a couple days ago.
Usually, I click the power button, the case LED turns on, fans start spinning full speed and they slow down after the bios screen appears. Now, when I click the button the fans start spinning full speed and never slow down so my monitor never receives a signal and the case LED sometimes is very dim or doesn't turn on at all. It's the same unless I try it numerous times that the PC finally turns on with no problems.

Pc Specs:
Asus P7H55-M LX - MOBO
Cooler Master B700 - PSU
Intel Core i7-870 - CPU
Corsair H75 - CPU COOLER
2X4GB 1333 DDR3 - RAM
Asus GTX 760 4GB - GPU

I recently upgraded my PSU,GPU,RAM and CPU cooler and they work flawlessly when the PC is on, so they're definitely not the issue.
Could this be a motherboard problem? I really hope not because than i would have to upgrade to a new Motherboard and i can't afford to get a new CPU right now.
Any help would be greatly appreciated!

Also i'm not sure what category this belongs to so i set it to Components,

 
Solution
B
One of the reason(s) the PSU is suspected of being faulty is that recently I had a relatively new good quality PSU which was found to be faulty after my computer had start up problems similar to this issue. Once the computer started it seemed to run fine. The suspect PSU was replaced and my computer has been starting up and running fine since.

The problem is there is no easy way to test the motherboard as such. The best way is to replace/borrow the PSU with another PSU (from a friend, neighbor etc) as a test.
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brispuss

Splendid
Dec 27, 2014
2,607
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26,490
It is not unusual for new components to be faulty on first use.

Start up issues suggests a faulty/failing PSU and/or motherboard.

Manually test the PSU using a digital multimeter. Procedure is here. Follow instructions carefully!

Testing the PSU unloaded may or may not reveal PSU faults until the PSU is loaded. So voltage measurements can also be taken off free PSU connectors when the PSU is re-connected to the components and switched on again.

There should be voltage measured at the connector pins. If there is no voltage, or the voltages are WAY out then the PSU is faulty. If the voltages are as expected then the motherboard is most likely faulty.

Alternatively, try another known working PSU which will either confirm or eliminate the CM PSU as being faulty, and in turn possibly suggest the motherboard is faulty.
 
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K

kristusea

Honorable
Dec 8, 2012
47
0
10,530
Well, i don't have digital multimeter so i can't do that.

I have basically already stress tested the PSU by playing intensive games and 3D modelling and designing. I would assume a faulty PSU would give me issues straight away but my PC has been more stable than ever with no issues (other than the one i'm currently having)

The only other PSU i have is a cheap unknown mark so i'm not putting that thing in again.

I am just so damn sure it's not my PSU.
Any tests i can do to my motherboard?
 
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B

brispuss

Splendid
Dec 27, 2014
2,607
26
26,490
One of the reason(s) the PSU is suspected of being faulty is that recently I had a relatively new good quality PSU which was found to be faulty after my computer had start up problems similar to this issue. Once the computer started it seemed to run fine. The suspect PSU was replaced and my computer has been starting up and running fine since.

The problem is there is no easy way to test the motherboard as such. The best way is to replace/borrow the PSU with another PSU (from a friend, neighbor etc) as a test.
 
Upvote 0 Downvote
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