Z77a-g45 Powering Up / Graphics Card problem

slak4515d002e2

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Joined
Aug 2, 2022
Messages
2
Hello

I've had my Z77a-g45 for some years, running absolutely fine.
It has been running with a i5 3570k, 16gb DDR3 ram, and an Nvidia GTX 1050ti without issues.
It is powered by my Corsair GC700w PSU.
Running Windows 10, no issues.

Today I switched out my 1050ti for a GTX Titan X 12gb card.
When I connect the card, the PC simply won't power up. I don't mean won't boot, I mean it just won't power on.
As soon as I disconnect the power from the Titan X and reattempt to power up, it powers up fine. I can access the BIOS etc.
I've update the BIOS to the latest version. It has made no difference.

So, the Titan X is powered by both an 8 and 6 pin PSU PCI-E cable.
My psu has 2x such cables. There made up of 2x 6+2 power cables. So I've connected them to the PSU (in the correct square / rounded holes) with a 6+2 and 6 cable set up. When I do this nothing will power on. But when I remove them, leaving the card in the pci-e 3 slot, it powers on.

Curiously, when I leave just the one 6 pin connector on, the system powers up. But obviously that's not sufficient for the card.

Any ideas?

The PSU clearly is working. It's a 700w PSU, the card only requires 650w, and when using a wattage calculator, when inputting all my setup with the exact cpu, ram, hard drives, and gfx card, I'm estimated to require 493W.
So I don't believe this can be a PSU failure.

The graphics card lights up when connected to the 6pin cable too, so again I don't think the graphics card is fried.
Clearly the moho isn't fried as I can access the bios / run windows when the gfx card isn't fully connected.

I'm hitting the point of desperation and confusion now. Does anyone have any ideas please?

Thank you in advance.
 

Alan J T

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Pleas list all part and model numbers >>Posting Guide<<


How old is the PSU they have a life of 5 to 10 years depending on model and make some even less
Make sure the GPU Power cables are not damaged
No Power on Suggest a short or not enough power is being supplied from the PSU

A PSU needs to be tested under a 10%-60% -80% load to see if it is working correctly and maintain correct Voltage.
 

slak4515d002e2

New member
Joined
Aug 2, 2022
Messages
2
Pleas list all part and model numbers >>Posting Guide<<


How old is the PSU they have a life of 5 to 10 years depending on model and make some even less
Make sure the GPU Power cables are not damaged
No Power on Suggest a short or not enough power is being supplied from the PSU

A PSU needs to be tested under a 10%-60% -80% load to see if it is working correctly and maintain correct Voltage.

So I've just fitted a brand new 850w PSU
(Seasonic BC-850).
And I've done a CMOS reset.
Guess what? I have the exact same problem. No Powering Up when the gpu is connected. But when the psu cables aren't on it, it powers up.
 

grossjef160a02ee

New member
Joined
Aug 6, 2022
Messages
3
I am having the exact same problem but with the MSI Z270 SLI Plus. Heres some of what I ran into
MSI Z270 SLI Plus motherboard
Processor Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz 3.60 GHz
Installed RAM 8.00 GB
System type Windows 11 64-bit operating system, x64-based processor
Current GPU Geforce GTX 1660 Super
Corsair 850w modular psu new

I have been running this rig for several years with no issues until I tried to upgrade my gpu to the msi rtx 3060 ti. This motherboard is supposed to support it but when I installed the rtx 3060 ti and tried to power on nothing happens, I mean nothing. No sounds, no error leds on motherboard its like it has no power but both motherboard and gpu are powered. I put the old gtx 1660 super back in and it powers on and runs with no issues. Thinking I may not have had the new card installed properly I put it back in making sure it was secure and powered and the same thing happened. Press power button and nothing happens. Put the gtx 1660 super back in and it powers up and runs with no issues. At this point it seems like it's the motherboard not supporting the rtx card but I'm not sure. Anybody have any ideas what could cause this or am I right that its probably the motherboard? All replies are welcome.
 
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