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[SOLVED] Help needed - PC turns ON and then OFF in a matter of seconds

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Hello guys, i need help with a PC.
As soon as i turn it on (power button) it stays on for seconds and suddenly turns off again.

[EDIT]
the problem seems to be getting worse:
1st time it happened during windows boot
recently it was doing it during bios post messages
now it stays on for a fraction of a second and than turns off

[EDIT2]
when it truns off, it turns on again after 1 second, and than off in a fraction of a sec... let's hope it' just a mobo death loop:banghead:

Tests i already made trying to turn it on:
x) heatsink is clean from dust
a) another PSU (info below)
b) single ram stick (both, single, inverted...), another slot (dual channel 1 and 3, 2 and 4)
c) check each and every cables, unplug replug all PSU connectors
d) unplug hard drive...
e) cmos reset (jumper), + no cmos battery for minutes
f) new cmos battery
g) tested with and without GPU.

HW specifications:
CPU i7
MB Asus Z97-Pro
RAM 16 Gb Corsair (2x8GB)
Cooler Corsair Hydro Series H80i GT Liquid CPU Cooler

GPU EVGA GT 740sc
SSD Samsung 850 Evo
PSU Corsair CX750M >> alternative for test Corsair VS 650

thank you for your time, for any othe rinfo feel free to ask. i hope we can solve this together ;)
 
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Have you tried using a different GPU?
 
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Have you tried using a different GPU?
ops i miss to report the test... i tried with and without current GPU. Unplugged gpu video cable on motherboard.
 
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so then there is only the cpu + mainboard left?
 
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so then there is only the cpu + mainboard left?
yeah....i was hoping for something i was ignoring.
i can add that this problem seems to be getting worse:
1st time it happened during windows boot
recently it was doing it during bios post messages
now it stays on for a fraction of a second and than turns off (before bios post beep)
 
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could it be the cpu ?
1. dried thermal compound?
2. the heatsink not sitting properly causing it to overheat and shutoff

need additional info as well, e.g how old is it? when did it start happening?
im suspecting the motherboard be the culprit if the motherboard is old, maybe a circuitry malfuction somewhere
 
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if you have a friend with changeable parts yes do it-but ya already did all the steps necessary for which i salute you!
hope y can solve it quick. i had a z87 msi g43 and i hated it-my guess goes to the mb-in all my 30 years of computer i had one cpu die on me and that was my fault
 
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could it be the cpu ?
1. dried thermal compound?
2. the heatsink not sitting properly causing it to overheat and shutoff
I can doublecheck it but it does the problem after a fraction of a second now...overheating requires some time i think.

if you have a friend with changeable parts yes do it-but ya already did all the steps necessary for which i salute you!
hope y can solve it quick. i had a z87 msi g43 and i hated it-my guess goes to the mb-in all my 30 years of computer i had one cpu die on me and that was my fault
So you suggest to try another MOBO and if the problem is still there...CPU. K i will set my mind on it. Let's see if anyone has other suggestions. TY both
 
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yeah you seem like ya know what ya do so not much to do there except mobo or cpu.
i salute you for doing all this stuff before asking bravo bravo.

last question: is it in a case?-if yes then make the simple out of case test with just the parts ya need for boot

sorry i thought its the mobo ya got in your sig-but its a Asus Z97-Pro which should be better then the msi low end stuff i had
 
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need additional info as well, e.g how old is it? when did it start happening?
im suspecting the motherboard be the culprit if the motherboard is old, maybe a circuitry malfuction somewhere
i think it's 5+ years old so mobo circuitry going banana is surely a possibility...some times i hope to be Louis Rossmann 's son...and than i wake up still older and far less competent than him ;)

+ i can add that when it truns off, it turns on again after 1 second, and than off in a fraction of a sec... let's hope it' just a mobo death loop:banghead:
 

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Clean your heatsink
 
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eidairaman1

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Heat or power
 
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Clean your heatsink
I did, i just forgot to write it on my trial/error list..updating
Heat or power
Power > you mean PSU ? I tested with a brand new one
Heat > mmm... is possible to generate the amount of heat you suppose in a very very short time ? the problem kicks in after pressing power button in 0,3 seconds. The machine is of with no powercable since yesterday and it still turns off after 0,3...before bios post
 
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If you don't see any bloated caps on the Mobo look at the flat black caps.. They have 2 solders on the bottom and 1 on the top.. Right about the middle look for brownish spots...
 

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I did, i just forgot to write it on my trial/error list..updating

Power > you mean PSU ? I tested with a brand new one
Heat > mmm... is possible to generate the amount of heat you suppose in a very very short time ? the problem kicks in after pressing power button in 0,3 seconds. The machine is of with no powercable since yesterday and it still turns off after 0,3...before bios post
Pull the motherboard out, run on a non conductive surface with minimum parts, psu, motherboard, ram, keyboard, mouse, gpu/igp, monitor.

No drives
 
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Pull the motherboard out, run on a non conductive surface with minimum parts, psu, motherboard, ram, keyboard, mouse, gpu/igp, monitor.

No drives
Can the OP not get into the BIOS?

couple things to add while you have the system out of the case, disconnect the case front panel buttons and lights from motherboard, ensure the motherboard push buttons are not stuck "in". hold the bios button while you power on to clear CMOS.
 
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eidairaman1

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UPDATE:
So i decided as a last call to replace thermalpaste. Off coure is was not fresh bacuse the PC has more than 4 years of hard work behind...but the problem was another:
There are 2 cables that you must plug to the Liquid CPU cooler: A and B (you can see those in attached pictures).
A goes from Cooler to motherboard USB3 header
B goes from cooler to FANS
Anyway one or both of them was not plugged correctly. So I assume that the motherboard was turning off the moment it realized that CPU cooler was not working properly. After carefully replugging those the problem is now gone for good.

thank you guys for all your suggestions. WE did it!

PS: is there a way to update my thread with [SOLVED] on title?..i cannot edit it anymore
 

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eidairaman1

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Motherboard manuals should specify that
 
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