System not turning on

Spooky_Fish

Spooky_Fish

Spooky_Fish

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Joined
22 Dec 2011
Posts
7
Hi

I am experiencing an intermittent issue with my set up. Sometimes my PC wont power up and others times is starts fine. Last time this occurred I decided to RMA the PSU (Seasonic G-550 PSU). However before I packaged it up to send it off I tried it again and my pc powered up and has been fine for 2 months+. The issue reoccurred last night. I had been using my PC all morning and powered it off once I was finished. Went to power it on in the evening and nothing.:confused:

I can see some LEDs on my GPU and the indicator LED's on the ethernet port light up. I can even charge my phone of the front USB panels. If I leave the power out of the PSU for an hour or so and try starting the system the fans all start then stop after about 10 seconds.

Has anyone experienced this before or something similar?
 
First thing I would check is there are no loose cables, especially at the PSU and Motherboard.

You would be surpised how many times a loose cable can be the problem and often caused if the computer has been knocked or moved enough. I have experienced this in the past where some days the PC is fine and others would shut itself off or not start, so check those cables are in correctly.
 
so I have tested the following.

~ Checked for loose cables.

~ Breadboarded the motherboard, cpu and 1 stick of ram. With no power on with current PSU but does power on with a different PSU.

~ Paper clip test the 'bad' psu and the fans spin up and it appears to be working.

~ CMOS reset using both the jumper and removing the battery.

Its all left me a bit confused as to what needs to be replaced :confused:
 
Sometimes a PSU can pass the paperclip and still be faulty. Happened to me PC wouldn't start all the time and had random shutdowns new PSU sorted it.
 
All original cables. Tested another power cable and directly into the wall socket.

system spec is:

Intel Core i5-4670K 3.40GHz (Haswell)
Gigabyte Z87-D3HP Intel Z87 (Socket 1150) DDR3 ATX Motherboard
Samsung 120GB SSD 840 EVO SATA 6Gb/s
TeamGroup Vulcan RED 8GB (2x4GB) DDR3 PC3-19200C11 2400MHz Dual Channel Kit
Seasonic G series 550w '80 Plus Gold' Modular Power Supply
Prolimatech Panther CPU Cooler
Asus HD 7970 Matrix Platinum 3072MB GDDR5 PCI-Express Graphics Card
 
Is there anything metal that could be shorting/touching the motherboard for example? eg a screw or something that could have fallen between motherboard and chassis? Any loose capacitors on the motherboard, what about broken/bent cpu pins?
 
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