G5 help - PLEASE!

[mickypol]

Hi all, I am a new member, any help with the following problem would be much appreciated!

PowerMac G5 Tower 1.6Mhz. Running Mac OSX 10.4. 2Gb
RAM

Watching a QuickTime movie, changed the screen resolution while the movie was playing and the G5 froze up although I had mouse movement.

Did a force shutdown and on restart nothing happens. I have a video signal on the monitor (CRT) but the screen is black. On pushing the start button , it tries to start with a couple of clicks from the hard drive but won't go any further in the start up process and the white power light on the front panel doesn't stay on although the fans are running.

Have tried all the usual keyboard keys to start up and also it won't start from CD. Swopped RAM around,re-seated video card etc, etc. A friend has tried my hard drives in his G5 and both are OK. Tried in Target Disc mode but no joy!

 

[eric2006]

You might want to reset the PRAM, NVRAM, and SMU:

http://docs.info.apple.com/article.html?artnum=300341
http://docs.info.apple.com/article.html?artnum=2238

 

[mickypol]

Thanks for that Eric but I have tried all those keystrokes. My G5 has a PMU restet button not SMU which I have pressed. It may seem a silly question but should this button be pressed when the machine if off (which I have done) or when it is powered on?

Mike

 

[eric2006]

It should be done when the machine is off, if you do it while it's on, it will reboot.

See this:
http://docs.info.apple.com/article.html?artnum=32473

According to that, there was a bad batch of video cards sent out, and you can get them replaced.. might want to try that. If it's not the video card, the logic board would be the likely failure.

 

[mickypol]

Thanks Eric, the problem is.....it won't boot at all. Can I do any damage if I press the PMU reset button when the power is on, (fans working but nothing else is!!)

Mike