PowerMac G5 not showing boot manager or open firmware

I recently got a PowerMac G5 Dual 2.5 GHz (7,3) from a friend of mine, and I would like to dual-boot it between Tiger (or Leopard) and Debian PPC. However, every time I try to bring up the boot menu (hold ALT/option at boot before chime) there is simply a black screen. Same happens when I try to boot to Open Firmware (hold CMD-ALT-O-F); just a blank screen. When I try to boot from the Debian CD, it's almost as though it is ignored, as I am put straight to OS X, but I can boot from the Panther/Tiger DVDs. I have tried resetting the PRAM, the SMU via the button on the board, and I left it unplugged overnight, to no avail. Can anyone help?

It's acting like there is a firmware password in some respects. It should be asking for your firmware password when a firmware password was configured but it doesn't seem to be. I've never used a firmware password, so I have no direct experince with it.
1) Might try the hardware reset. I'd try this first. You will have to search around to find where the hardware reset button is on your machine. BDAQUA help?
2) Might try the procedure to delete firmware password. I'd try it. Don't think it can hurt!
Maybe your are getting the firmware password? Do you see this image?
http://support.apple.com/kb/HT1352
http://reviews.cnet.com/8301-13727_7-57521667-263/use-the-calculator-to-reveal-a -macs-firmware-password/
Remove one memory stick. Then do as BD suggests.
BDAqua reminds me:
Then, the PRAM must be reset 3 times. (Command + Option + p + r).
http://www.securemac.com/openfirmwarepasswordprotection.php
You machine does boot to one partition always. Could install a linux boot manager in that partition. Yaboot on a ppc
The mac startup manager is installed in firmware cannot touch it. Linux boot manager is install on hd.

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mamapajama wrote:
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Blackberry Desktop Manager
version 4.3.0.17 (Nov.12 2007)
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H.
+++++++++++++++++++++++++++++++++++++++++++++++++
If successful in helping you, please give me kudos in my post.
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--regarding OSX: sometimes (and I emphasize sometimes) I can get the machine to start booting from an OSX 10.2 CD, but it won't complete the process. Sometimes I get a "prohibited" (as in no-parking, no-smoking) icon; sometimes it will start booting (grey screen, OS X Apple icon), then crash (horizontal grey and white jagged bars); sometimes it will show the OS 9 start icon (the tiny smiling Mac SE), but not boot at all.
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The beige Mac is now operating happily again. My original tentative diagnosis remains the same (although still tentative): corrupted PRAM from bad battery, compounded by bad cables that wrote corrupted data to hard drives, and also (possibly) allowing Tech Tool Pro (a utility that I now regard with deep suspicion) to create a "virtual" startup partition.
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--remember that the Ex Post Facto utility can be used to help OS X startup, not just installation. This applies to hard drives, emergency CDs, installation CDs, etc. If you can boot into any working hard drive partition (OS 9 or a backup OS 10), then run Ex Post Facto (same program runs on either OS 9 or X -- don't ask me how) and tell it what system you want to start up from. Also, the utility has sometimes told me that the startup extensions on the disc that I wanted to boot up from were bad, and offered to fix them (which works).
--at least on my Mac (beige, v. 2 motherboard), resetting the CUDA button, resetting the PRAM, resetting Open Firmware and "draining" the memory by unplugging the computer and disconnecting the battery for several hours ALL DO DIFFERENT THINGS.
Specifically, if I'm having trouble booting (from a hard drive or a CD), the FIRST thing I do is restart and resetting the PRAM on the fly -- holding down command, option, P and R at startup, and waiting for the chimes (preferably at least 3-4 times).
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If all else fails, I will unplug the computer and disconnect the battery, then push the CUDA button for 15 seconds and let the machine sit overnight.
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All this took more than two weeks, and the advice of this board was much appreciated. Now I'm on to my next adventure -- trying to figure out why a combo Firewire/USB PCI card won't mount an external drive on Firewire, but will on USB. I've tried two cards with same result -- but a Firewire-only card works just fine.)
Regards to all,
Graham

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