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Try attaching the device once the computer is running. With my Laptop if I have a monitor in the vga port as the computer starts up I get a black screen. if I take it out the computer boots up normal, I connect the monitor and tell the graphics card to switch to it.
That usually happens when the computer is booting up from another drive other than the hard drive... Try pressing delete when the computer start then make sure that hard drive is selected as the primary..
Remove hard drive, find out make and model of hard drive. Go to hard drive manufacturer's website and download testing software (if you have another computer with internet access). Should be a bootable ISO file. Burn the boot cd and run it on the host computer after reinstalling the hard drive. Sounds like a bad hard drive in my opinion.
If tried the monitor on two other computers with the same result -- definitly your monitor is faulty. Take it to the repair shop. To make double sure, run your computer with another monitor. If everything is fine now; you can blame the monitor.
check both your power and video connections to the monitor, sounds more like a monitor power issue.
if the connections appear ok, but screen still blank, try connecting a known good working monitor from somewhere else and see if it works with your pc, if it does, your original monitor is faulty, if it doesn't, you have a pc video issue.
Did you recently change or install a program that would affect the resolution and card output? Try booting into safe mode by holding the "shift" key during boot. From there right-click on the desktop and hit 'properties'-> 'display properties' -> 'settings' , check your resolution and drop it to 800x600 and then reboot. If everything goes back in normally make sure you have the right windows drivers for your video card. You can also check the driver version and settings while you're in safe mode. Sometimes the windows update drivers can act screwy and I would recommend getting them directly from your card manufacturer.