Can't reset Open Firmware!

I have a 1GHz titanium, and it has the 'sleep of death' problem - blank screen on opening the lid from sleep. (Only happens intermittently.) It has several other 'issues' lately that are driving me nuts, but one at a time. I would like to reset the open firmware, however on this machine, when I hold cmd-option-o-f on restart it does nothing. Literally.
The machine reboots, then sits there with a blank screen. Nothing happening.
If I release the keys, it does not go into a startup, it just sits there - note the fan is making a slight noise, so technically it is not 'off', however I have to hold down the power key and restart that way.
Is there a way around this? Not a software issue, as all this happens (or rather, doesn't happen!) before anything loads.
-frustrated
Powerbook G4   Mac OS X (10.3.9)   Titanium 15" Powerbook 1GHz Superdrive

Are you able to do a pram reset? (command-option-p-r). If so, do this 3 times and then attempt to go immediately into an open firmware reset.
About the sleep issue, I had also had that problem. I performed a reset that has cleared that issue (hopefully permanently). My computer is a little different but I believe the procedure is similar. I would consult the knowledge base to see what the procedure is for doing a reset. In my case, I basically held down the reset button (located next to my modem port) without the battery out and the power cord unplugged.
Hope that helps.

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