NEED HELP!

[Kynd]

Ok so i started tinkering with my gf's new pc last night, and the OC did not go so good, so i reverted back to standard settings and everything seemed fine, comp was running fine untill turned it off, the only change i made was using XMP profile 1, putting the memory to 1600 mhz, which it is rated to operate at, now when i try turn the pc on all it does it flare up for 2 seconds with all lights and fans working then instantly shuts down, then turns back on few secs later and off and on and off and on, rinse and repeat.. untill i power it down from the psu. The motherboard is the gigabyte GA-P55M-UD2, i thought perhaps the settings were bad and stopping it booting, so i tried to clear CMOS via the jumper, however this did not solve the issue.

This has now left me wondering, did the clear cmos just not work, or am i not doing it right, i checked the motherboard manual and it says make sure all power is off even at the wall socket and unplugged, which i have done, is this corrent? cause im not sure how it can clear the cmos or perform any electrical "action" well there is no power to the motherboard.....

Please guys i need some help sorting this out, its abit of a headache this time of a monday morning .....its my gf's day off from work, and she is ****ed her comp is not working.


P.S. I would also like to add, as this may help explain some other possible causes of problems, when the CPU was overclocked a core i5 760, it was @ 4 ghz with 1.35 vcore, temps were fine with the titan fenrir according to real temp, and no boot issues at all, but.... when i stressed the pc running prime 95, it would run perfectly for about 3-5 mins with no errors at all, but then suddenly the pc would just shut down totally as if i turned the power off, just a total shutdown, turning the pc on again from the main front panel switch would work fine and i was able to get to bios or straight into windows to continue trying to get it working, so i tried lowering the vcore this time around and when i started prime 95 it didint even last 1 second, it was instant blue screen, which is understandable, cause the cpu was obviously not getting enough vcore through it, so please explain to me then why when it did have enough it was just shutting down after a few mins.

I really dont wanna suggest this, cause its a pain in the arse if this is the case.............. but something is making me think PSU issues -.-, cause its the only thing i can think of to explain the shutdowns during full cpu load during prime 95, and it kinda explains why the comp right now starts for 1-2 secs with all lights and fans, then shuts down again.

The psu is a brand new http://www.overclockers.co.uk/showproduct.php?prodid=CA-008-CS , i will also add as a last note, that after the first pc shutdown, after the very first stress test with prime when overlocked using very conservative settings... me and my gf both heard a "pop/spark" sound come from inside the pc the first time i tried to push power button to turn it on after the first shutdown.

 

[Kynd]

No i have not, but please read above i edited my post to include more information.

 

[Kynd]

Sorrry i did not sleep much -.- 1.35 on the v core...., blame the gf for lack of sleep

The battery is in a pain in the arse position, right under the left side if the cooler, might be able to get it it, but ill need to remove to graphics card for sure......

Ill go do that now, and post back after.

Thank you for the advice.

 

[Kynd]

Ok well i removed the battery for a min or 2, just as the motherboard manual suggests to reset the cmos, and it is doing exactly the same thing when powering on, lights and fans for 1-2 seconds then off for 4 seconds, on for 2, off for 4 etc etc...

Kinda unsure what to do now.

 

[Kynd]

No beep codes at all, and iv tried powering up with both sticks of ram on their own, each in turn, neither changed anything so iv just popped then both back in. And no i dont think it has an internal speaker attached.

 

[Kynd]

maybe you fried the cpu! does the UD2 come witht he little 2 post number/letter thing? On my UD5 i can see at what stage the post is.

Nah it just has the phase LED displayl, but no "code" display, and i very much doubt i fried to cpu, im using a very good air cooler, and the vcore was nowhere near the limits, same as on my 4ghz core i7 920 that im posting on right now.

 

[Kynd]

I think you need to turn the computer ON when the jumper is on the clear status. It won't turn on though. After that reseat the jumper to the normal position and start the computer. I've never turned my computer off when resetting cmos via jumper...

Oh I just read the pop/spark gl with that, probably the psu

Is it possible that when non oc the pc worked stable, then when oc and under more strain the power supply was shutting down after a few mins load on prime?

 

[Kynd]

well, your psu is more than capable so that's not it.
Probably just died as you heard / saw a spark/pop... Maybe you have another PSU you can try with and see if that works?

I have a corsair HX750 in my current rig im using atm, but i would need to take my pc apart, which is a pain.... since its got mass cable management going behind the motherboard tray etc......

 

[Kynd]

BUMP!, i tried taking the MB battery out over night, at least 12+ hours, to make sure the CMOS is reset, and it has not helped at all.

So the situation is the same, just to recap iv tested with cmos reset, iv tested with both sticks ram on their own installed, the comp when power button is used powers up fully for about 1 second then shuts off for a few seconds then on for 1 sec, over and over untill i turn it off @ the psu. This to me looks like a hardware issue now, since if cmos is reset it cant be because of some overclocking or wrong system setting.

Im starting to think it's possibly the power supply? , since it seems to come on for a sec then not have enough power perhaps to fully power up and stay on?.

Im kinda stuck because i dont really have another psu i can test with, and i dont think i can just RMA the psu without being 100% possotive its the PSU at fault, any suggestions/help would be much appriciated.

 

[Kynd]

To clear the CMOS settings properly if you cant access the jumper on the motherboard you
should take out power cable out the back of the PC, remove the battery and wait about
1 minute, then put the power cable back in, and give it 30 seconds or so. then turn the
system on without the battery in, your system should then set the fans and stuff spinning
as if its going to boot then it will shut down. if you press the power button again nothing
will work at all. Unplug power again put battery back in. Re-attach the power cable.

After this your PC should fire up, but you will need to go into the BIOS and load the
default options or how ever you have it, it will need settings again and it will wipe everything
like time and date settings overclock settings etc etc......

If this dont work then i would say with the Voltages you said then you have fried something.

Hope this helps you out m8.

Thanks for the info, but like i said, the voltage i quoted was simply a typo, i never went above 1.35v which is well within limits, and temps never went above 71c when under stress in prime @ 4 ghz.

 

[Kynd]

^^ this ( I was typing while nkata posted )

Edit your first post to show 1.35v instead of 1.75v. Will save a bit of hassle

The Gigabyte boards I have used went through the same 1-2sec power on -> power off -> 1-2sec power on, etc... cycle was when the board wasn't happy with an overclock / wrong memory settings. But with you removing the cmos battery,etc... it rules that out.

I take it you've check the capacitors, etc... on the motherboard for damage & there isn't any ?

Only thing I could suggest is to get another psu from an online retailer to test the pc & return it within the 7 day DSR period. You'll lose around £20 in postage costs though.

Iv got a brand new psu coming later today thursday, ill post back after testing with it later. Thanks for the advice, and ya ill edit that first post...