Mac G3 plays startup music but nothing on screen

Hi,
Basically, my friend gave me this Mac G3 tower (Blue one) and showed me round his that it worked. When I got home and plugged it all in, I turned on the G3. It then played the start-up music but then displayed nothing on screen.
Does anyone know why this is happening? It works perfectly fine with my friends monitor.

Hi Don,
I'm having a similar problem with a B&W 350 MHz (rev 1 I think). I get the start up tone and nothing appears on the monitor. Not sure if the machine is actually booting or not.
I am trying to repair this machine for a friend. They had been having a problem with the machine booting into a blue screen. I suspected a corrupt directory, so I ran Disk Utility (from another machine) and also Disk Warrior. Both Disk Utility's Disk Repair feature and Disk Warrior found problems. Disk Warrior was able to successfully rebuild the directory.
I had removed the hard drive from the machine and put it in an external casing in order to run Disk Repair and Disk Warrior. Upon putting the hard drive back into the B&W and booting the machine, I was able to successfully boot the machine into Tiger. I tested the machine for a few minutes and it seemed to work fine.
Next, I ran software update and installed a new version of Safari and then after the required re-boot, tried to repair disk permissions. During the repair of disk permissions, the machine froze up completely. The clock stopped ticking and there was no mouse or keyboard response. I tried using the re-boot button on the front of the machine, but the machine would not fully re-boot. I get a boot tone, but no video.
I tried re-setting the CUDA chip by pressing the re-set button on the logic board, but to no avail.
Finally, I did take the battery out and had it tested at Radio Shack. The battery is showing a good 3.6 volts.
I have a second B&W (300 MHz) that is basically doing the same thing. Do you know what could be causing the lack of video signal?
Cheers,
Thomas

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