There is no display in the monitor when power is on
1. Check with the Power supply:
2. Check with the Hard Disk:
Most probably, your hard disk doesn't work. First check the IDE or SATA cable connecting your motherboard and the HDD. Detach first cable wires and then reconnect it. Try to put it on. IF still it doesn't try to replace a cable (IDE or SATA). If it still don't work with that. Have another computer and slave the HDD from the PC not displayed and check disk by running a DOS Command prompt by typing "cmd" then type "chkdsk" to see if the HDD works.
3. If the hard disk is ok, try to use another computer replace it with the Power Supply from the computer that doesn't display. When it is connected, switch on press "del" or "F1" or "F2" to log to CMOS. Try to look for "Health PC" section and try to see if the battery is ok. One way to determine the power is ok is looking at power input to 12 v to 12.6v. If it's lower than 12v your power supply must be replaced.
Try one of these steps.
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