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If you mean that nothing appears onscreen when you press the power button but you can hear the fans working then try this.
The quickest way to restore default bios settings is to remove the battery on the motherboard.
Important ..... Disconnect the power leads FIRST
Gain access to the motherboard and search for a small coin shaped battery. Note which way it fits into the holder, then remove it and leave the PC for 5 minutes. If you have a manual you can also check for jumper settings to discharge the bios battery.
Refit the battery (the correct way) and plug in the power lead. Cross your fingers and power up.