B450M 30 seconds Bootloop

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   Hi,

Helping friend build his first rig:

ASRock B450M Steel Ledgend
Ryzen 5 2600
Nvidia GTX 1660
2 x 8 GB DDR4 3000Mhz

1st boot failed because missed the 8 Pin CPU Power cable

2dn boot failed because because 2 x 4 Pin GPU power cable was not plugged

3rd boot, got the Bios on screen but error message when trying to install Windows 10 from USB stick. Tried several time but same result. Maybe Windows install on USB stick is faulty.

Boot from Linux live CD but error after a few seconds. Tried several times, same result.

The next day, took the rig home and uninstall all component. Motherboard on a text rig (Motherboard cardboard box) with only the 24 + 8 pin power cable. Bootloop every 30s.

Unplugged the 8 pin power cable and no bootloop.

Install GPU (CPU has no internal graphics), RAM (1 stick, 2 sticks, each time different slot, with and without front panel cables, removed GPU and all different combinations. Reset CMOS, removed battery.
Same result: 30s bootloop with the 8 pin and non without, no video in both cases.

I installed all components on a different MB and all run as expected.

Before I return the MB, any ideas of what I can try different? Or what might be the issue?

Thanks for your help!

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Azungu Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 28 Apr 2019 Status: Offline Points: 6	Post Options Post Reply Quote Azungu Report Post Thanks(0) Quote Reply Topic: B450M 30 seconds Bootloop Posted: 29 Apr 2019 at 12:18am
	Hi, Helping friend build his first rig: ASRock B450M Steel Ledgend Ryzen 5 2600 Nvidia GTX 1660 2 x 8 GB DDR4 3000Mhz 1st boot failed because missed the 8 Pin CPU Power cable 2dn boot failed because because 2 x 4 Pin GPU power cable was not plugged 3rd boot, got the Bios on screen but error message when trying to install Windows 10 from USB stick. Tried several time but same result. Maybe Windows install on USB stick is faulty. Boot from Linux live CD but error after a few seconds. Tried several times, same result. The next day, took the rig home and uninstall all component. Motherboard on a text rig (Motherboard cardboard box) with only the 24 + 8 pin power cable. Bootloop every 30s. Unplugged the 8 pin power cable and no bootloop. Install GPU (CPU has no internal graphics), RAM (1 stick, 2 sticks, each time different slot, with and without front panel cables, removed GPU and all different combinations. Reset CMOS, removed battery. Same result: 30s bootloop with the 8 pin and non without, no video in both cases. I installed all components on a different MB and all run as expected. Before I return the MB, any ideas of what I can try different? Or what might be the issue? Thanks for your help!

xhue Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 17 Aug 2018 Status: Offline Points: 634	Post Options Post Reply Quote xhue Report Post Thanks(0) Quote Reply Posted: 29 Apr 2019 at 3:12am
	Did you try another power supply?

Azungu Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 28 Apr 2019 Status: Offline Points: 6	Post Options Post Reply Quote Azungu Report Post Thanks(0) Quote Reply Posted: 29 Apr 2019 at 4:03am
	Yes, same results with a different Power Supply. And the original works on a different MB. I have a feeling it's the MB. But how to make sure?

alander Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 14 Feb 2019 Status: Offline Points: 43	Post Options Post Reply Quote alander Report Post Thanks(0) Quote Reply Posted: 29 Apr 2019 at 4:11am
	Are you using memory that is on the supported list? Is the default memory settings for the slower settings or have you tried setting the memory to slower speed? I have the memory at the faster speed in A2 and B2 slots. If placed in the A1 and B2 it takes awhile for things to get past bios and before it sets the memory to slower speed automatically on my mother board.

Azungu Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 28 Apr 2019 Status: Offline Points: 6	Post Options Post Reply Quote Azungu Report Post Thanks(0) Quote Reply Posted: 29 Apr 2019 at 4:19am
	I have the issue with and without the RAM installed. I cannot even get to the BIOS/UEFI screen to make any changes.

xhue Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 17 Aug 2018 Status: Offline Points: 634	Post Options Post Reply Quote xhue Report Post Thanks(0) Quote Reply Posted: 29 Apr 2019 at 4:43am
	All points to the mobo at this point.

Azungu Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 28 Apr 2019 Status: Offline Points: 6	Post Options Post Reply Quote Azungu Report Post Thanks(0) Quote Reply Posted: 29 Apr 2019 at 4:45am
	The MB is going back to the store. Will keep you posted. Thx!