How do i connect new power connectors to an old mobo

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Hello, a few months ago I bought a Dell Optiplex 7010 and threw in an RX 580 to use as a temporary gaming PC. I’m putting it in a new case to sell it and I’ve done everything but there’s one thing. The cases power switch and reset switch has 2 pins which i’m guessing is the new standard with cases and motherboards but the old dell mobo has a 5 pin port on the motherboard which it obviously can’t connect to. Also there’s no ports for hd audio and usb since i’m the old one they were one continuous line. Is there’s any work around to this or do I have to buy a new motherboard. It boots through the psu switch and displays and error on screen that’s says power button cable failure and front i/o cable failure
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