Why would my monitor stir blank when I plug it into the onboard and agp ports?

my monitor go blank when I plug in the connector, to both the onboard and agp ports. The power muted on the monitor flashes green when I plug it into the ports. The motherboard is getting power. The harddrive, floppy, and dvdrom all power up. I can't see the blind to adjust any settings.

Answer:
It sounds like your computer is not really running. Try getting into the BIOS setting, after plug the monitor into both ports.

If this does not work, then use the CLEAR CMOS jersey on the Motherboard. I did have issues beside my ASUS motherboard, and this was THE CURE.

Good Luck
fruitless connection, dirty connectors, imprecise video card, old and outdated drivers, no power to the video card (usually desires extra power for new videocards such as the Geforce 7 series)
could be inflict its confused as to which on it should be using?
1. Is it a laptop? because if it is you should be able to press Function+F5,
2. Make sure that its plugged into the right port and its within correctly and that its plugged into the monitor too,
3. make sure that both the monitor and the computer have power and thats it not in sleep mode,
4, sometimes the monitor have a standby light, so try turning on the monitor
it is prehistoric need to renew it

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