Question No power coming through even after motherboard replacement

Nov 29, 2020
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I recently did my first new build. I had an Asus TUF Gaming X570 motherboard initially. I thought the motherboard was broken so got it replaced. Now I've received an MSI B450 Tomahawk MAX and getting the same issue. I thought the motherboard was the issue in the first case because when I carried out the pin test on the PSU, the fans spun. Could the probably still be with the PSU?

The issue I'm getting exactly is a white LED lighting on the GPU but no fans or output from the machine on start. I've also tried shorting the power switch and still got nothing. Parts as follows: https://pcpartpicker.com/list/DhLzZZ

Would appreciate any help!
 
Nov 29, 2020
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Yes all connected, in fact I did the fan test again just now. Also the GPU light comes on so pretty sure it's all running.
 
Nov 29, 2020
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Installed the CPU 3 times now - no bended pins. Started with the new board on the cardboard box and tried to bread-board before putting it in the case. Stripped it down to just the CPU, cooler and RAM and still no response.
 
Nov 29, 2020
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Thanks for the help! Really appreciate it! I'm ordering a replacement PSU as you don't have a known good PSU to hand
 
Nov 29, 2020
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Hi, the B450 tomahawk max has out of the box support for 3xxx series (no bios update required). Confirmed on partpicker and on the Amazon listing. I have a 3700x installed. I would have thought that I'd get an error LED for the CPU if the motherboard was getting any power and the CPU was incompatible
 
Nov 29, 2020
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Sorry silly question back, EPS being?

I've connected the 24 pin and the 8 pin CPU cables to the mobo and then the PCIe cable to the GPU
 
Nov 29, 2020
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Hi! The RAMs are in slot 2 and 4. For single stuck testing, I placed it in 2 as per manual. Power switch is in the right pin. Tested by trying to short those two pins with a screwdriver plenty of times so pretty sure it's not them.
 

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