Computer begins starting then turns off then repeats

Custom built pc / Ga-z97x-ud3h
May 9, 2016 at 21:17:56
Specs: Windows 7 Pro 64bit, i5-4690K
My Computer begins starting then turns off then repeats. Yesterday evening I went to my computer and it was off though I remember it being left on. I pressed on and it began starting but died and repeated trying to start. It does not reach post, I cannot access BIOS or F9. Removing memory does not cause no memory beep. Unplugging hard drive (SSD) does not have any effect, it does not get far enough for it to make a difference. I am beginning to think that the power supply may be defective. Opinions and suggestions are appreciated. I also just cleaned out dust though it was not bad and has always run cool.
History: The machine has worked exceptionally well since built last summer. The only prior problem has been wake from sleep issue that SSD firmware update made somewhat better.
Components:
GA-Z97X-UD3H vers.1 - F7 BIOS
i5-4690K running at stock speeds
GTX750Ti factory OC
OCZ Vertex 460 as boot/OS, Programs
WD 1TB black storage
GSkill Sniper DDR3-2133 CL9-11-10-28 Two 2x4 packs (16GB) 1.65V at XMP settings
Noctura air cooler (runs very cool - always)

You have to be a little bit crazy to keep you from going insane.


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#1
May 9, 2016 at 23:42:29
Fingers,

If you cleaned the computer just before the problem started,
I'd bet that the cleaning caused it.

Posting this from a Windows 98 SE computer running IE 5.5 with
a dial-up connection. Not easy.

-- Jeff, in Minneapolis


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#2
May 10, 2016 at 06:29:49
Hi Fingers,

I'd lean towards the PSU too, you could test the PSU with a multimeter

This link describes the procedure well

http://www.tomshardware.co.uk/power...

personally though I tend to take out the PSU jump the black and green pins of the 20/24 connector to turn the PSU on then test each molex to see what outputs I get.

I know a lot of people say that you cannot test a psu that way as it is not under load, but at least it gives you some indication.

You are probably more knowledgeable than I am but hopefully the above would be of some help :) Good luck


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#3
May 10, 2016 at 16:10:23
Jeff: Sorry if I was not clear but the cleaning was a just in case after it began the problem.

Always: I will have to see if machine that is not being used happen to have the newer 24pin/8pin motherboard connectors, if so then I will just try that. If not power supply then it would be motherboard though visual inspection shows it looks good, including all visible capacitors.

You have to be a little bit crazy to keep you from going insane.


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Related Solutions

#4
May 10, 2016 at 16:13:36
Jeff: you really need a newer machine. I have retired machines much newer. And dial up??? Too slow for me.

You have to be a little bit crazy to keep you from going insane.


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#5
May 11, 2016 at 00:05:01
Dial up? is that still available?? ;-)

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#6
May 11, 2016 at 12:55:56
The Windows 98 SE computer is an old notebook computer that
was my only machine for a while a few years ago, and had set up
beside my Windows 7 desktop until 5 months ago. But then I had
to move and there is no room here for the desktop. I acquired an
Android tablet to fill in, but decided to set up the notebook since it
has some files I wanted.

I was surprised to discover that I can't even access my own web
pages with it and IE 5.5 and dialup. My web pages are the simplest
plain vanilla HTML possible, and small. Yet the home page stopped
loading after one or two images and a couple of lines of text. I was
able to post here okay, but it was terribly clumsy. Using this Android
tablet is awfully clumsy, too, but not as bad as that mess.

I want to know whether your problem is with the power supply or
motherboard, since my Windows 7 desktop has had an intermittant
problem with video going out at startup that I wasn't able to pin down
over five years since I built it. It could be the power supply, the video
board, or the motherboard. I might have damaged the motherboard
while trying to push the stock Intel CPU cooler into place. I was never
able to get it to go in, and bought a Thermaltake cooler that screwed
in easily.

-- Jeff, in Minneapolis

message edited by Jeff Root


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#7
May 11, 2016 at 16:09:57
I have been working and lots of things to do here a well so I have not had the time to even look for a suitable power supply here. I am typing on the older Family desktop, a Core2 era with Windows 7 on it which is not too bad except that I dislike the keyboard in here and there are are possibly 30 browser tabs open that I am not 'allowed' to close. Needless to say it is not what I would prefer but it works. I will update as soon as I get a bit of time, probably Friday.

You have to be a little bit crazy to keep you from going insane.


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#8
May 13, 2016 at 08:52:33
Update:
I tried a new power supply. No difference.
I tried systematically unplugging components (HD, SSD, DVD, Graphics card, connectors to front panel, fans, etc.) and tried everything except the CPU itself.
Next I cleared the CMOS and the system stayed on!!!
I moved it back into room and plugged everything in, reset BIOS settings and rebooted.
Keyboard and mouse worked in BIOS set up and prior to Windows loading but would not let me type in password. I rebooted into Safe Mode (worked in safe mode) and reinstalled USB driver from Gigabyte and rebooted. All works good now.

Thank you all for suggestions. I knew that I just had to systematically eliminate all possibilities and thought that if anyone had a similar problem recently I might find a quick solution that I had not thought of and saved the time waiting for a morning off concentrate on it.

Thanks again and I hope that someone will find this helpful with a similar problem.

You have to be a little bit crazy to keep you from going insane.


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#9
May 13, 2016 at 10:12:44
Awesome work Fingers glad its all working and thanks for posting your approach hope it will help someone else one day...

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