CPU swap shows VGA error LED on both PCs (6th gen and 7th gen swap)

[bwaber21]

Hello, I was swapping CPU's between PCs
(bazooka b150m, i7 6700k stock, 2x4 gb ddr4 2400, GTX 1070, 600 watt PSU, 250gb SSD, 2 TB hard drive)
(bakkoka b250m, i5 7400 stock, 2x8 gb ddr4 2400, RX 580 4gb, 600 watt PSU, 500gb SSD, 1tb hard drive)
I updated both motherboards to the latest BIOS and swapped the CPUs and when I turned them on they both beeped and the VGA LED was on for a couple seconds then they shut off. It was the same for both PCs and when I swapped them back to their original PC they worked just fine. I know that both GPUs are working just fine.
What could be the cause of this?

 

[Cdog042501]

because the motherboards arnt cross compatible even tho they use the same chipset that's intel for you make you buy a new motherboard to get the latest cpu

 

[bwaber21]

But the motherboard say that they support 6th gen and 7th gen with BIOS update.

 

[ThatVietGuy]

You may need to reset the CMOS on both motherboards after swapping the CPUs.

Some motherboards don't like dramatic hardware changes without a CMOS reset.

 

[bwaber21]

Thanks for the reply,
Do I really need to reset CMOS if I never even modified anything in the BIOS? Could it be because both of the PCs are pre builts from Cyberpowerpc?

 

[ThatVietGuy]

It doesn't hurt to try - lets put it that way.

But it shouldn't have anything to do with being prebuilt.

 

[bwaber21]

Thanks for the reply
Could there also be other reasons why it would do that?

 

[ThatVietGuy]

How sure are you that you updated to the latest BIOS?