Do any of the case fans turn on?
Are there any beeps from the case speaker?
Try booting with a minimal hardware setup to see if you can get into the bios.
Remove your motherboard from the computer case and put it on a cardboard box.
Remove all hardware that isn't needed for you to boot into the bios, including all drives and case fans.
Disconnect all internal usb cables and disconnect the Power and Reset wires that connect to the front panel header.
A faulty Reset switch or wires can prevent your system from starting.
Boot with cpu, stock Intel heatsink, keyboard, one memory module, graphics card and case speaker for beep codes.
Can you test with a less powerful video card?
You might need to test using a different power supply and/or keyboard.
You will need to carefully connect the two Power pins in the front panel header for a brief moment to turn your system on or off.
If you can boot into the bios, you will then need to reconnect the rest of your hardware, one at a time and then boot back into the bios.
Let us know what bios version you are running by looking at the label on the top of the bios chip.
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