Question Bought a 2nd hand 1155 mobo with celeron and my gpu was detected. When I put my i5 in my GPU cannot be detected. Please Help.

May 11, 2020
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Previous Mobo - MSI H61M-P31-G3 (DIED)
Intel core i5 3470
GTX 660ti

Replaced mobo with 2nd hand ASUS p8h61-m lx 2.0 (came with Celeron cpu)

Installed my i5 and GPU - no signal from GPU and not detected in device manager, although I can boot from vga.

I thought let me put old celeron CPU in and WTF!! Now my GPU works?

Never heard of this issue before.

Basically GPU is detected with celeron CPU that the mobo came with but not my i5.

Any advice?
 
That board might not support the i5 3470 with the BIOS version it has at the moment.

The I5 3470 requires the BIOS version 0308 and up to be supported on the ASUS p8h61-m lx 2.0.
I did update to the latest BIOS 1204. Still the same. Does it matter what cpu I had in when doing the update?