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Re: no input signal!
Try disconnecting your keyboard and switching the computer on again and see if the monitor comes on properly. If it does you have your problem. Then power down and connect keyboard back up. If it doesnt work then you may have to change the keyboard.
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The no input VGA signal just means that the monitor is not receiving anything from the graphic card on the tower. Is the card a digital (DVI) output card? You'll know by the connector, it's white and slightly wider than a standard VGA connector. If so, perhaps the monitor is set to the wrong input?
If that isn't the case, and the computer is using an on-board or built-in graphics controller, you could try resetting the system's CMOS settings by setting the clear-settings jumper on the system board, or simply remove the plug and CMOS battery for a few minutes. Check the computer's documentation on the exact steps to do this.
What size monitor were you using before? If you were using a smaller monitor and everything was fine maybe this new monitor is out of range for the graphics card. I've found that not all graphics cards, especially older ones, will not run a monitor as large as 24 inches. If you can, connect this new 24 inch monitor to a computer with a more powerful graphics card. If it works then you will know that the problem is with your computer. Also connect your old monitor and go into control panel and see what range and resolution your graphics card will support. You may need a more powerful card to run the new monitor.
I had this happen sometimes after a windows update/reboot. If the computer is on, hold down the power button until it cuts off. Unplug the power cord. Wait for a couple of minutes. Plug the cord back in, and turn on system.