Question Gigabyte Motherboard - CPU and DRAM lights

Jul 10, 2020
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I'd decided it was time to clean the inside of my computer, so I'd taken the heat sink off and replaced the thermal paste that's used. During this, I'd taken the CPU off the motherboard, cleaned it and replaced it. Now, when trying to boot up, I'm getting 2 lights showing on the motherboard, first the CPU light turns on, then turns off as the DRAM light turns on, which then goes back to just the CPU light being on and then everything turns off. It cycles through this until I turn the PSU off. Any suggestions as to what my problem is short of me having to buy a new CPU?

Edit: it's a Gigabyte Z370XP SLI mobo