You can unplug the Power Supply cable which goes into the wall from the side of the power supply (and then plug it back in); you can try another place to plug in the machine. You can remove the CMOS battery from the motherboard and replace it again. You should check all the connections and cables in the box and make sure they're properly connected to and from the motherboard and the video card. If these things don't work you may try borrowing an older video card from somewhere and see if the system works with it. In case it works with another card, you should seek out the warranty for the 3090. If you have two or more slots you may remove all the RAM sticks, grab a single stick and then try putting it in slot 1, if it doesn't work, try putting it in slot 2 and continue on until your run out of slots. If there are no results try the same thing with another stick until you run out of sticks. If you have more than one PCIe slot for the video card, try putting it in the other slot/slots to see if things get better; you can also dust the GPU off (very, very carefully) and do make sure it's properly and firmly connected to the Power Supply and motherboard. Can you get to the BIOS at all?
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