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Setup is usually entered by pressing the delete button or F2 (or F1 .. it depends on your computer..) during the boot-up process.
However, as you say there's absolutely nothing on your monitor which you know works, suggests that the fault lies elsewhere. If there's nothing at all on your monitor it may be a failed video card/chip.
I take it that your computer actually powers up even though you can see nothing on the monitor?
If you can, try another video card in your computer. If the monitor then works, you know it is the old video card/chip at fault.
If, after trying a replacement video card and there's still nothing on the monitor, you'll have to suspect a motherboard fault.
I suggest to open your computer and unplug your power supply and look for the color green and black cord which plugged from your motherboard. Then find a piece of wire and short the color green and black wire to test if your power supply is working and plug to your power socket. And check your electronic parts (capacitor) near at your processor, it might your capacitor blown out.
I would recommend rechecking your connection to the motherboard. All wires from the power supply to board and making sure the front panel switch connection are correct. Also, make sure the power supply is compatible to the motherboare. even though a 20-Pin ps will connect to a 24-Pin board, it still does not work. Good Luck
Make sure your monitor is connected to the proper video connection- that is if you have a video card in your machine and a video connection on your motherboard. If you connected to the motherboard and you have a video card -your screen will show nothing even though you are powered up. Dont know your situation, but just checking. Ive seen others do this.
Check the power supply - does the computer turn on and just sit at the boot screen with an error message? If the power light on the front is not on when you press the power button, your power supply might be faulty. Check the power cable to make sure it's connected properly.
Next, if the computer power light comes on but nothing displays on the screen, make sure that the video/monitor cable is connected properly. If nothing is displayed still, the CPU, memory, video card, or motherboard might be faulty. Most likely is your motherboard. You may be able to find a replacement one on the internet, or it might just be more cost effective to get a new computer.