Cannot reset NVRAM, Powermac will not boot

This happened just after I edited the NVRAM content using the 'nvram' command. I have a Universal binary plugin that won't run on PowerPC, figured it might have something to do with endianness, so I tried changing the boolean value for "little-endian?" in NVRAM from false to true.
At the time I though, no matter what, I'd be able to revert back to the original state by resetting NVRAM. But no!
I get the startup chime, but the display is blank. I've tried resetting PRAM and NVRAM (cmd-alt-p-r/-n-v), but holding down those keys after the first startup chime, the computer doesn't seem to reboot (i.e. no second chime).
Is there any other way of resetting the NVRAM? I can't access open firmware either.
Thanks in advance.
Message was edited by: Marcus Hedenstrom

So, now I have read the manual, and resetting PMU (note that the manual claims the PRAM-battery should remain in its socket for the procedure) should reset the PRAM.
I am suspecting my PRAM battery has lost so much charge it can no longer provide the required voltage of 3.3 - 3.7 Volts. Thus, there's not enough juice in there to do the actual reset.
I'll try replacing the battery and see what happens.
Message was edited by: Marcus Hedenstrom

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