New build powers up and down

mrsnooch

mrsnooch

mrsnooch

Associate
Joined
1 Sep 2011
Posts
53
Location
Belfast, Northern Ireland
Hi folks,

Firstly if this is in the wrong area please re-locate to wherever it should be! Thanks.
Secondly, I appreciate any help in advance.


Last night I replaced my Gigabyte Z68 board with an ASUS Sabertooth Z77, and at the same time replaced my GTX 580 with a GTX 680.

Obviously this involved stripping the old machine of fan connectors, CPU and cooling, RAM, mobo power cable etc etc.
I then put everything back in, have checked, double checked and triple checked that everything is in nice and tight and secure, but nothing helps.

What is happening is I plug in the power cable into the PC, and the green LED lights on the motherboard, so power is getting to that no problem.
I then press the Power button on the case and all the fans whirr up and it sounds as it normally did. This lasts maybe 5 seconds tops before the power is lost and all fans die down again, however within 2 seconds it all comes back on. This repeats over and over until the power cable is removed from the case.

I am running the same PSU I have been for the last 3 or 4 years, and that is a OCZ 750W. If anything I am using less power as I believe the GTX is more power efficient but have also removed a Fan Controller that I was using previously - I no longer need it.

Does this sound like a PSU issue? Power is surely getting through if it all starts to switch on and whirr up? I tried the same process minus the graphics card - same thing, and also using only 2 of the 4 sticks of RAM - same thing. I haven't tried minus all RAM, not sure if it would even boot anyway?

Could the motherboard be defective? I also removed the CPU (i7-2600k) and re-seated, but again, nothing.

What would cause a PC to begin to load for a few seconds and then reboot, over and over?


Note - I did not have a monitor plugged in at this stage but I highly doubt too much would be displayed on the screen at this early stage. Also, no beeps of any kind to indicate any errors.


The specs again are

ASUS Sabertooth Z77
Intel i7-2600k
16GB HyperX RAM
GeForce GTX 680 2GB
PCI Creative Soundcard
3x Hard drives (2 SSD, 1 HDD)



Many thanks in advance,
Mark
 
No worries!
No I'm afraid I didn't, this was at 1am this morning so was just quickly trying some things before bed - my head was fried at this stage!
I will be trying this when I go home, but I am anticipating other failures as opposed to the RAM. I'll try the other 2 sticks, and will test the other 2 slots also.

I will also plug a monitor in to see if there is infact anything coming up, but it's so quick between powering up and rebooting that I can't imagine so.

Thankyou
 
Lemin said:
quote guru3d...

What would happen if your PSU can't cope with the load? Here are some pointers:
•bad 3D performance
•crashing games
•spontaneous reset or imminent shutdown of the PC
•freezing during gameplay
•PSU overload can cause it to break down
Click to expand...


Thanks Lemin,

Have actually ordered a 1KW PSU to cover my ass just incase.
There's really nothing else I can remove from the PC that isn't a necessity, and as I mentioned, I've already removed a Fan Controller and (Didn't mention this actually) a WiFi PCI card, so really it's running less power than before. I guess it may have blown or something, but then I would assume pressing the power button I wouldn't get a single fan, or even the mobo LED lighting?
 
dunn2010 said:
750 watt PSU shud be able to run a 680 easily.

it is seeming most likely the motherboard tbh as without the gpu it still happens. if would be tempted to swap out back to my old mboard and try that with the new gfx card in see if it works.
Click to expand...


Thanks mate, I'll have to try this tonight. Have already had a nightmare with the motherboard when it took 3 days extra to arrive after they lost my package so would make perfect sense that the thing doesn't work :rolleyes:

Thanks for your input.
 
Yeah I know it's overkill but I'm thinking of it as future proofing :)

Yeah well I'm hoping it's the PSU as one is on the way! Thanks for your help and I'll give it a go tonight and see what happens!

Cheers
Mark
 
Hi folks,

Okay so I moved everything across to the old Gigabyte and its basically doing the same thing! However what's different is it's not rebooting, its only powering off (could differ between motherboards?) and also it's shutting down a lot faster than the ASUS, its barely even getting started and it switches off, again, maybe just how this particular brand of motherboard is dealing with the issue?

So i'm fairly confident now that it's the PSU, new one should be coming Friday or so and I'll see what happens then.

Cheers
Mark
 
Okay bit of a development here - just did the "paper clip test" and the psu whirred up just fine and continued to run until i stopped it. So either that means a component is shorting it or that it cant handle the full load??
 
Sorry, third post in a row.

I use a Corsair H60 cooling system for my CPU so have just changed that to the previous 'default' cpu fan that came with the processor and exact same thing. I am also currently sitting with only the RAM plugged in, not even graphics card or sound card. It really does have to be the PSU, right?? I know the passing of the paper clip test doesnt mean its in 100% working order..?

Thanks folks,
M
 
Well.


I am feeling like a fool. I'm sitting here connecting the cables that I need to the PSU and find the PCI-E and look to see what end goes in the PSU and which goes in the card. "CPU" it reads. Ah wrong one, I think. Then....wait a minute. I never plugged in the CPU cable from the older PSU to the CPU slot on the motherboard...


KILL. ME. NOW. Never even thought, no power getting to the CPU before there it isn't going to power up and go anywhere. So feeling pretty stupid but at the same time I'm glad I got the new PSU because I was sick of my non-modular PSU and the amount of spare cables going everywhere.

Sigh. Thanks for the help guys, only my own dam fault!!
 
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