IMac g5, no video output

I just replaced the logic board and power supply on my G5 imac, both of which were bad. Now, when I power on, all three LEDs on the logic board come on, t there's no video output. The video had been working fine before the logic board and power supply failed.
THe tech note says to try resetting the PRAM. We have a wireless (usb) keyboard, and holding down option-apple-p-r doesn't seem to do anything. Is there another way to reset the pram?
Any other suggestions would be welcomed. Replacing

THanks Moke.
OK, I bought a wired keyboard and tried to reset the pram. I think it worked -- it rebooted the computer and the chime came on again. But there's still no video output. Not sure if that means I should replace the screen or the video inverter or both or if it could be something else altogether.
Any ideas?

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Good afternoon all.
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The Mac is running Leopard 1.5.7 and I'm outputting to a fairly old Panasonic CRT TV.
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If I do go and change the resolution in "displays" in the sys' prefs' then it just seems to keep the 1024x768 resolution on the Mac but this time without stretching it.
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Thank you again in advance.
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Hi
I have the same config as you: I have been using it for years to view on my tv dvds or videos from the web.
To my knowledge there is no way to acheive what you wish: when you plug the adaptor in the mac adjust to your output source and its main display (the g5 display) will reflect that with the result that it becomes very difficult to use.
Maybe there is a way to try changing the resolution in a middlle"configuration" which would give an acceptable viewing on the tv as well as on the g5.
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I currently have an iMac 27" Intel Core 2 Duo model (November 2009) and whenever I connect to my HDTV via VGA I cannot set a resolution higher than 1600x1200 @ 60Hz.
I know the TV is capable of doing so. My MacBookPro 13" with the integrated Nvidia 9400m is capable of setting a resolution of 1920x1080 @ 60Hz.
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Your HDTV should have a multitude of inputs, but your trying to connect via VGA possibly because you are already using the rest for other devices?
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Hi,
From time to time I like to connect my PowerBook to TV thorugh S-video (using adapter S-Video to scart) to watch movies with friends etc.
Though, it has been some time (over half a yar) when I last watched a movie on TV that way. Since I know for sure that I have been able to connect my pb to tv via s-video with no problems I can't understand whats wrong now.
Here's the thing. When I connected my PB to a TV now, it shows the picture in black&white on the TV. Anyone know how to get back the colour image? I have the same cable set that I used before to connect to tv (latter is the same one also) without any problems - full colour. So, I think the problem is software-related (maybe os x update).
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Dah•veed

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Hello,
See the diagrams below depending on which model you have:
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NOT SURE: I have seen the Apple adapter (http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore.woa/7200505/wo/0K4TK pkMz7f922WszZYxFQMUy31/1.0.19.1.0.8.25.7.11.2.3) but it says it is for the MAC mini and the G5 only... does that mean it won't work for me?
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the other options are not what you need.
cherios,
∏

IMac g5, no video output

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