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When the PC starts up, do you get a BIOS display at all? Try fitting a graphics card into the board instead of using the built in port, if that works check the BIOS settings to see if the built in adapter has been disabled,
If there a separate AGP Video Card in the system? If so, is there also a VGA connector on the motherboard? If you have both, try swapping the screen over to the other one. You may have reset the default video card back to the motherboard.
However, it looks as though you are using onboard video as you appear to be using 256Mb shared RAM for the video memory as your total should be 1536Mb.
In that case, you may need to do a rurther BIOS reset. You can find the complete instructions here
If you have TWO graphics ports (one onboard + one seperate card) then double check you are plugged into the right one !
If you get the same issue with another monitor then it is more than likely that your graphics card is pooched.
If you are using the onboard then you can buy a pci express card to replace / bypass the onboard.
If you are already using a seperate graphics card you may well need mo replace it.
1) Bad connection to the monitor, check the cable connection, if you see or suspect any damage, buy a new monitor or test with a friend's monitor.
2) Video card could be bad, if it has a video card, you could simply buy a new card to see if it will fix the problem. If the video port is attached to the motherboard (meaning onboard video), the motherboard could be damaged.
3) The motherboard could be bad. Sometimes fried motherboards will garble the screen like this on bootup.
Do a reset: Turn the computer and monitor off. Unplug the monitor video cable from the computer and unplug the monitor power cord from the wall outlet. Let it sit for 5 or 10 minutes. Plug everything back in, turn on the monitor, then start the computer. Sometimes that will work.
If you still have the same problem, try to borrow a known to be good monitor from somebody. If it works, then you know your monitor is bad.
It's also possible that your video circuitry is bad. If the monitor plugs straight into the motherboard (onboard video), then you'll need to purchase a video card and install it. Disable the onboard video first.