No video input and continuous beeping sound

To tell you exactly what is wrong so grab the manual and look up the [b]Beep Error Codes[/b] and then compare the printed Beep Errors with what the computer is producing and you'll then know what has gone wrong.

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Check the manual for the system or the motherboard to determine what the beep code is and what that relates to as a failure. Most often, with no video, it could be the memory on the video card or the memory on the systemboard has failed. Trying another video card of any memory size would help diagnose whether it's the video card or the system memory at fault. Swapping around the memory for the system could cause a change in the beep code and tell you which memory card is bad, trying them one at a time will narrow down the fault. If neither of them makes any difference, then the systemboard itself could be at fault.