I have recently had an issue with my pc, where when started u it boots for about 1.5 seconds then powers down.

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WizardlyGamer

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I have searched endlessly over the internet to find a solution and all that was said was either a dead psu or some other crucial component. So naturally i tested my psu and got a green light on that. Next i tried my gpu and BAM! Pc boots up no problem without the gpu being installed on the mobo. So i Assumed it was my gpu and to my surprise when i put in a brand new gtx 1070, the same exact thing happened. Conclusion: The mobo has to be the issue (more specifically the PCIe slots) Because the system boots normal without the brand new gpu in it. Am i correct in assuming that this is the problem??? I don't want to keep spending money on parts to only have it not be a direct source of the issue. ANY help on this terrible happening would be great.
 
Solution
panathas
You did something that you should never have done. Why on earth did you plug your GPU to the PSU without being connected to the motherboard PCIE slots? You risk burning your GPU that way. When you plug the PCIE power cable, the GPU must always be on the motherboard slot. You may have already damaged your GPU.
As for your previous boot problems it's either your motherboard or your PSU. To rule out the PSU you must test your system with another unit. Borrow one form a friend. Also try to plug your GPU in another PCIE slot on your motherboard just to make sure that you don't have a dead motherboard slot.
If you do test your system with a proper PSU and it doesn't work you can be 99% certain that you have a bad board.
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WizardlyGamer

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it can power the entire mobo, CPU Water Pump, Fans and everything else just fine for seemingly forever. The cpu and all of those fans have to draw enough power that if it was the psu it would do the same 1.5 second boot thing right?
Also: It only occurs when the gpu is in the PCIe slot, even when the vga connectors are in straight from the psu it will power on for more than the 1.5 second deal. So only when the gpu is touching the PCIe slot is when the issue occurs.
 
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clutchc

clutchc

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It could indeed be something other than the PSU. But once the card is connected to the PSU, it's electrical load is added to the system. A weak or failing PSU may not be able to handle the added load.

Do you have another card you can test with? Using just the weak iGPU alone isn't much of a test. I'm guessing at there being a iGPU because you never listed your system's specs.
 
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WizardlyGamer

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I have an AMD FX-8350 overclocked to around 4.7-4.6 GHz
An MSI 970 A SLI Krait Edition Mobo
MY old gpu was a gigabyte gtx 960, my new one that still has this problem (It is Literally 3 hours old) is the Asus gtx 1070
i have 8GB kingston hyper-x fury memory ruuning at i think 1866 MHz
and an evga nex 750b power supply.
And exactly the vga connector straight from the psu would not be able to handle the power of the gpu so it is pretty much ruled out that the psu is the issue i believe?
 
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WizardlyGamer

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The cable that powers the gpu "VGA" is what it says on it, so when that is plugged in to the GPU it draws power right? so if it was the psu it wouldn't boot at all when that was plugged into the gpu, but only when the gpu is in the actual PCIe slot is when the system powers on off in the 1.5 second thing. And also i noticed when plugging a fan into the 3 pin fan header on my mobo while the system was off it would do the 1.5 second boot thing when i turn it on, when the system is on and i plug same fan into same fan header it is just fine, this is very weird to me as it only does the 1.5 second power thing when the fan gets plugged in while the system, is off.

Also: basically if i plug anything into the power supply while it is on, (tried with hard drive) it will cause the system to shut down and do the 1.5 boot thing, Note the gpu is not in the PCIe slot at this time it is only plugged in via the "VGA" cable, so it is probably the power supply or a very impossible to find problem with the mobo, i will assume the psu is the culprit and buy a new one, please inform me if this is a valid decision.
 
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WizardlyGamer

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OK so something weird happened, I reomved the cpu from the socket blew it off put it back and screwd my cooler down and plugged everything back in and bam system boots up for more than the 1.5 second thing, but the only thing is nothing shows up onscreen, no boot logo or anything just stays black. The whole system including the gpu (in the PCIe slot) lights up and fans starts running so now my problem is that i have no bios or anything at all onscreen.
 
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panathas

panathas

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You did something that you should never have done. Why on earth did you plug your GPU to the PSU without being connected to the motherboard PCIE slots? You risk burning your GPU that way. When you plug the PCIE power cable, the GPU must always be on the motherboard slot. You may have already damaged your GPU.
As for your previous boot problems it's either your motherboard or your PSU. To rule out the PSU you must test your system with another unit. Borrow one form a friend. Also try to plug your GPU in another PCIE slot on your motherboard just to make sure that you don't have a dead motherboard slot.
If you do test your system with a proper PSU and it doesn't work you can be 99% certain that you have a bad board.
 
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