I tried to hook up my power mac g4 tower to a monitor and the screen is not coming on. It states monitor is on, now connect to computer.

First thing to note is that the monitor is getting power - is power save originating in the computer or monitor ?
Try the monitor with a different computer and the computer with a different known good monitor
This will yell you where to focus your efforts

8.March.2015

its is telling you the truth (99.9999999% of the time)
believe it !

no PC stated
no TV model stated nor clear connections stated.
are you trying to get the PC (the tower means that)?
to run to video concurrent ports at the same time?

so do both fail,
VGA side
and DVI side,
you never said.

hard to help lacking
what TV
what Tower
what connections, and special adapter (HDMI)
the TV has DVI??
sorry, cant see what you have there. at all.

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Try to hook an external monitor. If it still persists, then the problem will be the videocard. If not, then you''ll just have to replace the lcd of your computer.

Try replacing the motherboard cmos battery. You can get a replacement at radio shack.

Try restarting, if still not picture, then try hitting function key + F5 at the same time. Some laptops have a little icon the key that looks like a monitor as well.

If not try hooking up your laptop to a regular computer monitor and see if you can get a picture and fix the problem that way.

Check your pins at the connector.  I had a problem like that before and it was a student who unplugged the cable and tried to reconnect but bent 2 pins which shorted out the computer and monitor.  If that isn't noticable try connecting the monitor to another computer or laptop and if it still does the shorting issue then its in the monitor cable or board on the monitor.

Hi,
If no monitor works on your Mac, but the machine is booting, the only assumption I can draw from this is a faulty display card.
Try another display card and see if this helps.
Regards,
Graemevm

You've probably thought of this, but make sure the fall did not disconnect the cable that connects the tower to the monitor.

The Mac fora could help you better :)