Question Tried to upgrade my GPU, but now my computer won't start ?

[NeedHelpYikes]

Anyone able to help me? I tried to change out my 1060 6gb for a new 4070 card and now my computer won't boot, is giving me a red light for "CPU" (even thought I didn't touch the CPU at all)

Z590 UD AC motherboard with i7-11700k CPU with an 850W powersupply. Previously had a 1060 6GB GPU, but upgraded to a 4070.

I just installed the 4070, but now the computer won't boot and the motherboard has a light for "CPU". It does however spin all the fans (case fans, CPU cooler fan, GPU fans) and the GPU lights up, but the front fan LED lights don't turn on and the monitor doesn't detect anything.

I didn't touch the CPU at all (which is underneath a big fan cooler), so I have no idea what went wrong or how to fix it.

Anybody run across this before? Why would my CPU light come on for a GPU change?

Things I have tried so far (none have helped):

- Putting the old GPU back in.

- Using no GPU at all

- Reseating both RAM sticks (have 16gb x 2)

- Trying one RAM stick at a time.

- Leaving the Motherboard battery out overnight, then putting it back in.

- Checking that all power cables are plugged in

- Unplugging / replugging in the "CPU" power connection on the motherboard (when it's unplugged from the mobo it doesn't change how things work - computer has same red light issue with or without that power line plugged into the mobo when computer is runnning).

- Checking that the power cords are not loose on the PSU end. They are all still in.


Not sure what to do. I obviously want to avoid just buying a new mobo and/or PSU. Everything was working fine before this change, I didn't notice any big spark or anything, and I changed the Videocard with the PSU off and unplugged.

The only thing I haven't done yet is look at the CPU itself, as it's under a big air cooler that is annoying to remove.

Small note: my "CPU" power on the mobo is an 8-pin power connector, with a 4-pin slot beside it. Only the 8pin power connector is plugged in, but given the lack of other wires, I don't think I ever had the extra 4 pin power connector ever plugged in. Does that make sense, or is that something I should look at?

Thanks

 

[Darkbreeze]

I promise, it was not "repaired". Motherboard manufacturers don't repair boards that are faulty unless it's something as simple as replacing the BIOS ROM. They generally just ship you a replacement board and toss the old one into the scrap pile. Either way, very strange that just swapping the graphics card would do that, but at least it's resolved now.

 

[NeedHelpYikes]

I promise, it was not "repaired". Motherboard manufacturers don't repair boards that are faulty unless it's something as simple as replacing the BIOS ROM. They generally just ship you a replacement board and toss the old one into the scrap pile. Either way, very strange that just swapping the graphics card would do that, but at least it's resolved now.

It was the same board - I had accidentally bent a certain SYS_FAN group of pins (which still work) and they came back with the exact same bend.

 

[Darkbreeze]

Then it was probably a BIOS related issue. BIOS ROM may have been zapped, or they may not have found anything to be wrong and simply reinstalling your hardware might have corrected something which you just didn't notice before. Something unplugged or not fully seated. In any case, like I said, at least you're back on the road again and that's really all that matters.