Question New build won't Power On/POST ?

[Matt V.W.]

Built a PC from scratch for the first time in about 20 years. Here are the specs -

Ryzen 7 5800X
Gigabyte Aorus B550 Pro V2
Enermax Liqmax III 360 AIO
WD SN570 Blue 1Tb NVME (x2)
Corsair Vengeance LPX 32Gb DDR4 3000 (2x16Gb)
Thermaltake Toughpower GF1 750W 80+ Gold
Corsair 4000D Airflow

Above list bought new from Amazon

Generic (possibly Dell) RTX 3060 12Gb
Bought used from a friend.


When powering on, CPU LED trips without any fans or other indicators of system attempting to power on. I've flashed the BIOS using USB, checked and reseated all power, both ends, cleared CMOS, and reseated CPU, no change.

Please help, I've exhausted all of my troubleshooting skills.

Matt

 

[SoumithCS]

PSU or PSU cables I think. Try remounting the Heatsink and try re-inserting the cables. Re-Seat Ram and CPU. Try booting PC W/O GPU and enter into bios and see if everything are recognised

 

[Matt V.W.]

PSU or PSU cables I think. Try remounting the Heatsink and try re-inserting the cables. Re-Seat Ram and CPU. Try booting PC W/O GPU and enter into bios and see if everything are recognised

Thank you for the assistance, I have already attempted your above suggestions to no avail.

 

[COLGeek]

Does anything flash on the screen(display) at all? Is your display connected to the GPU or one of the motherboard video ports?

Are both the 24-pin and 8-pin power cables connected firmly to the motherboard and the PSU (assuming modular PSU)?

 

[Matt V.W.]

Does anything flash on the screen(display) at all? Is your display connected to the GPU or one of the motherboard video ports?

Are both the 24-pin and 8-pin power cables connected firmly to the motherboard and the PSU (assuming modular PSU)?

I do not have any power up to the MB when flipping the power button. I was connected through the GPU, it is currently removed so that I could access the CMOS battery to clear CMOS

 

[COLGeek]

I do not have any power up to the MB when flipping the power button. I was connected through the GPU, it is currently removed so that I could access the CMOS battery to clear CMOS

Is the toggle switch on the back of the PSU in the on position?

 

[Vic 40]

Might want to recheck the front i/o cables as well.

 

[Matt V.W.]

Is the toggle switch on the back of the PSU in the on position?

Yes.

 

[COLGeek]

Yes.

Had to ask. You would be surprised how often that is overlooked.

 

[Matt V.W.]

Had to ask. You would be surprised how often that is overlooked.

Oh, yeah. No worries, absolutely valid question.

I'm thinking about hooking my AIO into a fan port on my old machine to see if it turns on. Just to rule out the AIO as a source of trouble.

 

[Matt V.W.]

Update - Was able to isolate the AIO, it powers on with another MB. So, either something is wired wrong or it's a dead CPU or MB.