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you can try buying a cheap pci express video card and install it inside one of those slots and connect your monitor to the new video card and see if it will boot up. some computers have a beeping sound if something is wrong. if theres no beep then try to remove everything like memory and hard drives and just leave the power supply. if it still doesnt beep when you restart the computer, then it might be the motherboard.
did u replace the video card with the same kind of model ? i guess yes ... when system starts hit the f8 key and than go in to safe mode ... mouse wont work so use arrow on the keyboard .. and in the safe mode just log in to admin account if available or login to ur account and see if that still happens .. and if it doesnt ... remove the drivers for the graphic card from add and remove programs and restart the system and go in the normal mode and than install the drivers again ... and if the display disappears in the safe mode or u have install a different graphic card than ... reseat the memory cards and that should resolve the issue .... if that doesnt work out when the system starts hit f1 and stay on the BIOS screen for 30 mins if the system doesnt loose display than u need to reinstall OS ... that will surely work out ... the resolutions given above if u follow them correctly u will have a working system in no time
Change the settings from the display settings panel. (Right click on the desktop and go to display settings)
You should see 2 monitors graphically represented there.
You can make the monitor that is greyed out active by right clicking on the monitor, and selecting active.
It appears that the display resolution set in your display properties is out of the range that the LCD can display.
Boot to the ENABLE VGA MODE by pressing F8 to get the Windows Boot Menu. If you can get to the desktop, then go to display properties, and see if you can change the resolution to higher settings and maintain video. (If the video blanks out, then it should revert to the previous setting in 15 seconds)
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.
Ok, with your current set up, what beeps are you getting? Also, while you have a blank desktop, hit CTRL+ALT+DELETE and you'll have Task Manager come up, click File and then New Task and type in "explorer" without quotes and hit enter.
That should restore your desktop. Let me know how it goes.