Black screen unless I reset CUDA, every time

It's Tiger 10.4 dual 450 ethernet. Help!

[Texas Mac Man's PRAM, battery, PMU tutorial|http://www.geocities.com/texas_macman/pram.html]
[Apple's PRAM reset directions|http://docs.info.apple.com/article.html?artnum=2238]
If you have a digital multimeter you can check the condition of your present battery. It should read at least 3.2V if it is the 3.6V half-AA battery type. A new Battery provides 3.67 Volts DC. A bad battery in hand provides under 3.2 Volts DC. Ideally this should be measured while the battery is under load; added recommendation from Hans777:
I have recently found out that an exhausted battery will still indicate >3.6 V with a high internal resistance VM.
Checking incircuit: powercord disconnected press PMU reset button for >about 5 sec before measuring.
Checking outside: load the battery with a 1500 Ohm resistor when measuring.
Alternatively, test the battery while it is still in the computer.

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