Mobo msi z790 not turning in

What about it?

Hello all, I just got a new MSI z790 Tomahawk wifi ddr5 but it won't start. I put everything together and I found out that. I just put only the mobo down on a plastic bag and it still won't start I updated the bios via USB, the led flashed for a few minutes while the CPU led was on and then they turned off. It still worn start Any help? Thank you

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