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Hi ;) Sound like you got a bad driver file loaded can you go in in safe mode or when the computer first starts up in WindowsXP hold down the F8 key to go to the startup list and pick VGA mode and that will load with default video drivers.
When you disconnect the monitor cable, the display you see is from the monitor itself. It's telling you that the monitor has power and is working, but that you don't have the cable connected to your computer. So the trouble is in your computer, which isn't sending anything to the monitor.
Your computer may not be starting up when you turn on the power. This is pretty common, and may be due to a bad power supply or system board. Or something may be wrong on one of the devices connected to the motherboard (one of the drives or a card plugged in to an expansion slot). You'll need to figure out what is keeping the computer from starting. The easiest way is to unplug all devices from the motherboard except for the power supply and try starting the computer. If the computer starts up you'll know that one of those parts you disconnected is at fault.
Another possibility is that the video card (integrated video on the motherboard in most computers, or a separate card) isn't working. The computer may be starting up and getting in to Windows, but you just never get any video to the monitor. If you are hearing all the sounds of a normal startup (disk drive activity and then finally whatever startup sound your Windows makes), then you need a new video card. If the board has integrated video you just need to install a new plug-in video card of whatever type fits the available slot on the board.
If your fans power up but you see no image, then your computer has failed its startup test. Now you have to find out what the problem is. Start by opening the case and disconnecting everything but the keyboard, CPU, memory, and video. Now try to start it. If you still have no signal, it might be your video card if the monitor shows a message telling you there is no signal. Memory could also be a problem. If you get a message telling you there is no boot device, then turn the computer off (push in the switch for about 7 seconds) and connect the hard drive. Now try to boot. If it works, then suspect the CD drive. If after doing all this you still get no signal no matter what you do, and if the video is part of the motherboard, you're probably looking at a new motherboard.
You can indeed install another video card, but this may not be your trouble. Are you absolutely sure your computer is running normally except for the video? That is, do you hear all the other sounds that usually go along with normal startup (hard drive activity, Windows startup sounds through the speakers, etc.)? It's very unusual for a motherboard to fail so that everything works except for video out to the monitor. You might be facing a computer with some other issues, like memory or a deeper motherboard problem, causing it not to start.
If you do decide to install a new video card, be sure you get one that's compatible with the motherboard (proper type connector) and power supply (not a super whiz-bang card that may need more power than your current supply can provide).
The beep code you mentioned is either a video problem or RAM problem, that is what the beeps mean. Check your RAM one by one in case you got a bad stick, making sure they are properly seated in the slots. Since a new video card did not slove the problem then it also could be a motherboard issue, video slot dead. If your motherboard is still under warranty contact the manufacturer to see if they'll send you a new board. These are the common problems for the symptoms you describe. Hope this helps.
Remove the BIOS recovery jumper near the battery on the motherboard and attempt to boot. If the system displays a startup screen, replace the jumper on pins 1 and 2 (pin 1 will have an arrow by it) and configure your bios appropriately.
Sometimes after changing BIOS settings the computer will not start or will possibly give error messages similar to yours. I have at times had to remove the power source, remove the motherboard battery, and set the motherboard back to factory default settings. You also stated that you installed a new motherboard. That could also be a potential problem. If the computer has never started with the new motherboard, the new board may be defective.