Power to monitor

Recently bought a Mac Pro (PC convert) and love it.  However, I'm noticing some boot up errors.  I already spoke with Apple support and he had me reset my PRAM.  This morning, when I booted up my Mac, the startup chime sounded as normal, but the monitor did not start up.  The green power light was on, on my Mac Pro Tower but my monitor sat idle with no picture.  When I pushed the startup button on the tower, the computer sat idle for a few seconds and then the monitor came on.  Any suggestions?
thank you

Hi-
Welcome to Discussions!
The 23" display has a DVI-I, USB and Firewire connectors.
Connection of the DVI and power is all that is necessary.
The USB and Firewire allows for the hub (USB and Firewire ports) in the display to be used for peripherals.
The cable does not disconnect from the monitor.
A keyboard, ideally, should be connected straight to the tower, not to the monitor.
With the keyboard attached to the tower, boot to Safe Mode (hold Shift at start up), reset of PRAM (Command Option+PR held at start until second startup chime) are typical first troubleshooting steps.
Boot to an OS install disc while holding C is also a good test to see if the video card is functioning.
A final hardware test, that of trying a different monitor, or, trying the monitor on another machine, is good to determine whether or not the monitor may be at fault.
Since the tower is not responding to keyboard commands, you might try resetting the PMU:
http://support.apple.com/kb/HT1939

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