Trying to post B460 Tomahawk for the first time - help please!

Smudge_08

Smudge_08

Smudge_08

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Joined
5 May 2021
Posts
5
Issue
New System build on MAG B460 Tomahawk - cannot get Mobo and CPU to power up together – my 13-year-old son’s first build – please help!

***Fixed - Rookie error in connection PSU to CPU - thanks for all the help***


Set-Up
Main Board: MSI MAG B460 TOMAHAWK (Socket LGA 1200) DDR4 ATX
Bios Version: UEFI BIOS as shipped
Video Card: MSI GeForce GTX 1650 4GT LP OC
PSU brand and model: Kolink Enclave 500W 80 Plus Gold Modular - 12v rail Rating of listed PSU: 41A single rail
CPU: Intel Core i5-10600K 4.10GHz (Comet Lake) Socket LGA1200
Memory: Corsair Vengeance LPX 16GB (2x8GB) DDR4 PC4-21300C16 2666MHz Dual Channel Kit - Black (CMK16GX4M2A26)
SSD/ HDD: WD Blue SN550 1TB NVME M.2 2280 PCIe Gen3 Solid State Drive (WDS100T2B0C) – Not connected
CPU COOLER: Arctic Freezer 34 eSports Duo White CPU Cooler
Raid Card: Not sure if we have one
Sound Card: N/A
Keyboard: Corsair Gaming K55 RGB Keyboard


Problem
Motherboard successfully powers on when CPU is not connected. CPU colling fans and GPU fans (both powered from Motherboard) work. CPU warning light is lit. RAM is attached in slots DIMMA2 and DIMMB2
When CPU is connected, the Motherboard does not power up.
Motherboard successfully powers on when CPU and RAM are disconnected. RAM warning light is not lit.

Tests
Have removed and re-seated the CPU, mother board, GPU and RAM and have retested with the same results.
I don’t have an alternate CPU to test with.
Unlike lots of other MSI Mobos, this one does NOT have a Flash Bios button, it only has a Clear CMOS jumper.
From what I have read, it may be that I need to update / flash the Bios, but I am stuck on how to do this without the Flash Bios button.

Would really appreciate any help.
Thanks
Alastair
 
Last edited:
You've carefully checked with the pins on the LGA1200 socket? Take a photo from a few angles and look for any bent/out of place pins first.
 
Hi there, thanks for the reply. We did do a quick visual check but will try again as you suggested and let you know - will be in a few hours. thanks
 
Oh, also check for motherboard shorts to the case, it is very much worth building the system out of the case, just on top of the motherboard box and it is much easier to diagnose. Just use a single sick of RAM (in the correct slot, and the onboard graphics, don't connect and HDd's or SSD's or any peripherals either.
 
As above, if you have a DVM check the 12v rail coming to to 4/8 pin EPS connector on the motherboard, you have connected that, right? :)
 
Defy Belief said:
I'd be looking at the PSU...Kolink not got a great rep for them, had to rma one myself for a friend with a similar problem.
Click to expand...
Thanks for that. I had assumed the PSU would be fine as we have been able to power the Mobo fine with only the Mobo connected.
Is it a common fault for it not to send power through just one / some of the connections - e.g. to the CPU?
 
Smudge_08 said:
Thanks for that. I had assumed the PSU would be fine as we have been able to power the Mobo fine with only the Mobo connected.
Is it a common fault for it not to send power through just one / some of the connections - e.g. to the CPU?
Click to expand...

The CPU is the first thing that causes a major current load on the PSU's 12v line when starting up, and thus if insufficient can stop a system completing POST.
 
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