System cannot find bootable devices

[Itzspandex]

Specs

 

Cpu: I5 10400f

Mobo: Asus prime b560m-a

Bios: 0403

Memory: Gskill trident z 3200mhz 32gb (4 channel config)

GPU: Asus ROG Strix RTX 2070

Storage: Samsung 850 Evo 500gb (boot drive)

Seagate Barracuda ST2000 HDD

PSU: Corsair HX1000

Cooler: Corsair H100i CW-9060009-WW

 

The Issue

 

I just upgraded my CPU and Mobo.

Machine posted perfectly first time but for some reason, although both drives are detected in the uefi bios utility, no bootable devices are detected. My Samsung SSD is meant ti be my boot drive and worked perfectly fine with my old mobo. Any ideas on how to troubleshoot this?

[TrigrH]

2 minutes ago, Itzspandex said:

Any ideas on how to troubleshoot this?

(advanced mode F7) Boot tab > enable CSM (compatibility support module)

[Itzspandex]

1 minute ago, TrigrH said:

Boot tab > enable CSM (compatibility support module)

Are these default settings fine?

[TrigrH]

Just now, Itzspandex said:

Are these default settings fine?

Yes

[Itzspandex]

4 minutes ago, TrigrH said:

Yes

Worked like a charm man. Cheers

[Jakub Krjak]

I am having the same problem but the Launch CSM option is disabled and greyed out. Updated bios to latest from ASUS - 0811 to no avail. Any idea how I can enable CSM?