[SOLVED] Will a 7th Gen I7 CPU work in 8th gen motherboard?

Dec 12, 2020
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I have a new Gigabyte Z390 Aorus Pro motherboard and an I7 7700K CPU I was going to build a second system. They're both Socket 1151, but when I try to power it up, the power comes on for 1 or 2 seconds then turns off

The motherboard manual says it supports 8th gen, but the cpu is 7th gen, are is it not backwards compatible?

Thank you.